Malicious PDF — malware analysis report

Static analysis result for SHA-256 a276080e8e6e2977…

MALICIOUS

PDF

86.2 KB Created: 2021-08-18 00:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7930b363e3a81fc9aa7bbba6893ad49 SHA-1: d7bdd5cd1df5bff66129e470d9a120e799e20660 SHA-256: a276080e8e6e2977ce5a677f197802885e9227e59b2c54c538b113463fb56258
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, pointing to compromised WordPress uploads and potentially disposable hosting, designed to lure users to external sites. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c87adee87---73195412374.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd658882c6---potupitefukatetilive.pdf
    • http://185.33.116.145/~acus01/upload/files/42378398963.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/nekawutujifevo.pdf
    • http://lynhuagiasi.com/Images_upload/files/gonisoju.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a78a421b4---jolelif.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/vd9bfrv4lgsov1qh1rf6vpmrd4/xugotukeko.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/4d882a3da71828088e3b4967d8e41933/paxolomimopebe.pdf
    • http://kalikraft.com/images/file/29703097036.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/a768b38f91c477d9d77f365bc055005e/witosaf.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/9e95e0ac44e07dbd437a9bfe308e7d66/linelezapobokivugeb.pdf
    • http://augustaelectricalwork.com/editorData/file/keziwabo.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f494d5255---domixitavopofewopa.pdf
    • https://balaji-technology.com/userfiles/file/39591229422.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/0kitn8lh8ev5u5qmffvqi245cc/49162236144.pdf
    • http://damnoen.com/ckfinder/pho/files/venalijosar.pdf
    • http://sccsfz.org/upload/sizikek.pdf
    • https://braus.uz/images/shared/file/51765755997.pdf
    • https://shidoremicrosys.com/media/85018884378.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a479ec1f94d6fe2bd2432aa5255ad569/nexinajumovukapifekaz.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df8344aaec---98961276178.pdf
    • https://vegan-eshop.cz/data/file/xonilijiwiwumozo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dyson+dc44+animal+charger+light+flashing
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e979.bin
a1c6bea149b8d08b378899b271c18a940aaed86b8e84b139f3e2f81408487b40
pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 17824 bytes
font_01_sfnt_off00011827.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11827 16792 bytes
font_02_sfnt_off0001303e.bin
6581855414eb4716c6dfe0d978bc62e07fa392c9e4c0101d9223cf692a038792
pdf-font-stream PDF embedded font (sfnt) at offset 0x1303E 11116 bytes