Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cc6fa1d7a161c5…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 03:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 620b3468b1769aff278fc9b99e86d84b SHA-1: 4ce5e4fdda76072651892a501769f70221e0b55e SHA-256: d8cc6fa1d7a161c5371b3176c324c21a753648897edb9c1953916b021c59a7e9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple PDF files hosted on various domains, many of which appear to be compromised or disposable. The heuristic 'SE_CALLBACK_LURE' suggests a callback phishing or tech-support scam pattern, indicating the document likely aims to trick the user into calling a number for fraudulent purposes. No scripts were extracted, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xedulichhaiphong.vn/images/news/files/tedanoxodaranafit.pdf In PDF document text
    • http://sellmysayarah.com/userfiles/files/63911865564.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/u9apoth3agf5bpp65sr9k3lle6/xogikiz.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613b180a74e17---sajilazapajovozokomunix.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/63304260058.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/83077210094.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134144506d2d---rirunutitabebino.pdfIn PDF document text
    • https://rosycaffe.com/file/65270565172.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/64739055353.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/6673958495.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7758dfb48---41082058792.pdfIn PDF document text
    • https://dol-rtknetwork.com/uploads/files/23338099433.pdfIn PDF document text
    • http://kammed.com/userfiles/file/50516745151.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/46646155256.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/linavi.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/60071317077.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12953125941.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/31080441271.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/supibawub.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/53098054575.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/78152929527.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/33490475893.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/24680809302.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/1ustnom6geuf9su8359gldl34n/52842254546.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/75230197981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+android+emulator+for+app+testingPDF 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_off0000d587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 17304 bytes
SHA-256: 47ce3dd593b847d4abbcad3cf073639af51cc0794eaf8675a394c3ff57b9689c
font_02_sfnt_off00011955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11955 10996 bytes
SHA-256: cff2bb7ee55f26465b314f96780b0a5883086c2487847f3062021ca9f00e6ba1

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