Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d4d4ec4d49468f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 02:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 080afc3bc02996a5b3bb4e7f84977526 SHA-1: d2adf17c2f3fbd16781269e2502542c8a8364333 SHA-256: a6d4d4ec4d49468f5a85fa4a645d4ea178a18e1cf8811829bf4aea42bba87858
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many of which appear to be compromised WordPress upload directories, suggesting it's part of a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c728bcec5---12910404021.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eece3058a5---bukat.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/nawobariba.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/jinetewuxipuroziteziziti.pdfIn PDF document text
    • http://stfrancisfrankford.com/clients/9/90/9051900d87e3fdd5bc97eff612ac54c4/File/gixezopusejokabowagolivak.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/79rppissq840f9e3dks4soacp1/28354118456.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/65179670580.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/62640449602.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/bf81245ebb1cb6e2d77fb45f0e13f07c/14967277228.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/jagebusitibokusifumibuxun.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/pugalirogujo.pdfIn PDF document text
    • https://ms01bet.net/contents//files/gowuzepamidu.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6ae531a35e544c39d3f1b47e0af6b1c7/79174512952.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/8d6d76242567c9c660262f105a4d69ca/87380148436.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b015e7a0a1---norolisaduzekukuf.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/vuvag.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081137ae3702---64197687927.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5cd5d3a3ebf937e18d1426135f13109/58195692537.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/nikiwitajewepavejobibu.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d67419b7451c66e45e6111767aefc1cc/71578423529.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef9fec5f40---puzefaxekadonapulobu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092930bca46c---pejalugudikexomepewum.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/nabamoku.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ca48565ec---33001937844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=acknowledgement+form+2018-19+pdfPDF 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_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 11404 bytes
SHA-256: 7482c63d75c3c2b5de933c31477f4f88bfad4fcbd4d871f83f8ef16607357296
font_01_sfnt_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 18128 bytes
SHA-256: f33dce059d80dc218ac420d812603a28d9bf734100e9557241eb186e46e69b46
font_02_sfnt_off00012e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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