Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1b9a904c01b7b5…

MALICIOUS

PDF

86.1 KB Created: 2021-06-26 15:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a71fa1a83ea8f2cba70409cd0d7bae5b SHA-1: fceb1c7dda3c80484763becd055e0d4a81c43de3 SHA-256: 4e1b9a904c01b7b5278351cc7e2766287e4ab70067c3e832bd448c9142a2ee5f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple compromised WordPress sites hosting PDF files. These links are likely intended to trick users into downloading further malicious content, possibly a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608028f7c0410---90950438710.pdf In PDF document text
    • http://quickvideo.nl/userfiles/file/fekifugiroruvagu.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/16698637007.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f81e98987---nufajexikemavidixajem.pdfIn PDF document text
    • http://prestopc.it/upload/file/95290463253.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/046afa70c6739c746fa5d06cb722e89d/46876550051.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/13367984380.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/58076918164.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4b3c0988d---nuxugumizoraruvugapovufuj.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/021e8327e1617a070db523e104b9787d/22194718653.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffebd322a1---fepujarerirebewib.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad983ada2b9---rerakaku.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/7874311720.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16088087b2ac07---nederixipurilal.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b098c44bf---danikegelotuzuw.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/lamewa.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ced2fcf52d---tetife.pdfPDF link annotation
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ad1582aed---41892954037.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0abad7f8---46937043549.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078edaa06c17---kifiruvilagefukaguju.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e111db9fb35b40f3ff6b2f7f9111a778/zupibululalujavobugaf.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ba3fcd65ac3e22c24257de57e9a39012/46471203217.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/jqn1a3aae4326h1oh77p6q8eri/51502608516.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f0260d5d8---42556259640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=formula+of+nuclear+densityPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 10828 bytes
SHA-256: e5a572969576604370f5f3773605097114ed0a88f60a30012e1ae41cf4880ef1
font_02_sfnt_off00011d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D30 17632 bytes
SHA-256: 40096afbfa7c1bb0102c6a34c91e5c3225b4e7ad7c35862f0d1732532c7cf599

Open this report in the interactive analyzer, or submit your own file for analysis.