Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c4c9d4d4dd2212…

MALICIOUS

PDF

86.9 KB Created: 2021-09-05 04:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26a1a82b0d08ef8f73602d4cc473ce30 SHA-1: b8c33439058db1b06086a9a2ab6be9cd32904d35 SHA-256: d9c4c9d4d4dd2212b210d98ff24bef26751aaa942659ce83dec722a890ed29ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests an attempt to manipulate search engine rankings or track user clicks, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://catamma.ru/uplcv?utm_term=electrochemistry+exam+questions+and+answers+pdf PDF link annotation
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/3d0a4fbf0948edfe75c9032619c67338/sudavuvuro.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcc9b43951---8807795925.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/makinuvafuje.pdfIn PDF document text
    • http://atiksigorta.com/files/pabolilanatibaja.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160868207b690d---pevufetabinosolokol.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210702170437095.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02521a73e9---19111953192.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/wagarojunepawogiv.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608586294dd93---76958375504.pdfIn PDF document text
    • http://getvisa.ru/images/File/15808415472.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/gunimatesoreb.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/metinojovomuvajazemit.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/muvuvibibipukumides.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/punabijazovoraguzet.pdfIn PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/46024694036.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100b74bc5404---tojefoxoluner.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/pulaxanexozefilurob.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/rezukabewox.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/30262917412.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/i1ooe5097kaqipj73g0d5lt166/saziperabijizuzosu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb6f07ac54---lerilesemafajikiw.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607734ccd25ef---36802334674.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/nojipebixegufenifoka.pdfIn PDF document text
    • 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_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 17872 bytes
SHA-256: 566533aadf5a142f29f1dceed9456abd5c9c2480a2232d49a0ae13bfe1f50a1b
font_01_sfnt_off00011ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC3 11416 bytes
SHA-256: 9ebda01055d270ddd8ac2f86cc54d8e352ddf7744be9dae2fbfff184a04a6f7d
font_02_sfnt_off00013568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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