Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a57629f734ecea…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 09:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ccd35c145e948a8d416dd6cb62aa24dc SHA-1: 5cdd9d949355690ee100058b41d0bc71084d5516 SHA-256: a8a57629f734ecea53e4927e580bd2b5cb5f6c96afcd783d4ccd72644438f831
196 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious phishing content. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The 'SE_CALLBACK_LURE' heuristic indicates the document may prompt users to call a number, a common tactic in tech-support scams or callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • 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 http://valdhans.cz/userfiles/file/79089985311.pdf In PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/1f939911a183c55a9eccab4f725738f7/botunesiwivorufawinunem.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/23421015344.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/31df7b7e331d8ccd9242a554553dff6d/85718355435.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/wuxuwifagebu.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/73136708352.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210723_193353.pdfPDF link annotation
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608acbb2edda1---doravilute.pdfIn PDF document text
    • http://kezmosas.hu/files/file/jasirijowopapula.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/wugetavuzana.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/lovisiwekalaxej.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/90682016865.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/2609f6515051c101242e871429227dfb/rotuzamomiji.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/8v0mntqp9j8r1aafac8ckhndbl/xofekitegajofe.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__610054192B4D1.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607364945fd6c---zeparasaxugebaretiguje.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fee4b6087---36424494912.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/roxebuzuxeta.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3394fa6918---fababiwewisuko.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/d2373oufugmk2fg58tl4f0ku9t/85645007202.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b121603a20d---82972902168.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/ca1db699346bdc5cbf129446b59f99a0/tukuzirufenulupujazunozam.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/53278747381.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/53691269593.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1028e60a31b29f8eeec74fbe77a0bd97/76161984222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=code+of+ethics+for+professional+teachers+philippines+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_off0000da00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 16656 bytes
SHA-256: 28e3fff263cb90ac51d79139baead9d82d159835e355adca08c9c9479d6fcc1d
font_01_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 10748 bytes
SHA-256: f641a8b9bfce38283363fbd57564d983e1cb5301a64ec373da6dc462e069474a
font_02_sfnt_off00011de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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