Malicious PDF — malware analysis report

Static analysis result for SHA-256 c155b8ca8df789cc…

MALICIOUS

PDF

77.5 KB Created: 2021-06-21 19:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 396bb292af6eb50ed0b1404fd6983134 SHA-1: b9136974db4fe738e06f017c89f514353f6be33a SHA-256: c155b8ca8df789ccc74f70bc57681c996d9b8443a2db699a5fd3db82590a9220
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits multiple indicators of malicious intent, including links to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this, aiming to trick users into downloading a payload. Although no scripts were directly extracted, the PDF structure and linked URLs strongly indicate it's designed to deliver a secondary malicious file, likely a Trojan or phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://alhouti.com/userfiles/file/kinobodu.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a281410a835---sezuzizonozavumib.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1741adfcb4f8da00d3c9e69bc5478953/ranaga.pdfIn PDF document text
    • http://gptools.net/userfiles/file/46544403459.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609654dfe9d0f---bazisifomimixureni.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/90264831570.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d596bf3e505f9761dbb91974b4771a25/47363134425.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aef7f4bf92---24321797422.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/40523491117.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9eba6f522---35381554846.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/37750683741.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/mgbg0sed5qpqub6shbnt23br76/kakenapukuju.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/28005374904.pdfIn PDF document text
    • https://activepymes.com/pub/file/gepovisolonifedelotaxivid.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/47645493728.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/84910565751.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ebf5b40071913dd5f556f4805d5fb672/2152826801.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/rarugikebemobarojidukod.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c805ccb81d---rewokonalobab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=vidmate+app+fast+download+vidmate+apk+for+android+freePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 5368 bytes
SHA-256: 9a70ea97d7a9c3bf152da571f0056eb1e13d2c59a67b6d36b3ae0ef0160ecb4b
font_01_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 10784 bytes
SHA-256: e0bddd92ecd93da5f442a809c5430abce091466319231573c072733d9ab56b01

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