Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3164fd6c2967a2d…

MALICIOUS

PDF

91.0 KB Created: 2021-06-29 03:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6b728426cc5a8ecdc0bd2cb82e2a91b7 SHA-1: a3e07d1c2c95004c097baf05fd9aacfb3483bc2e SHA-256: f3164fd6c2967a2d22a234cb3b103dc9ee988b006d4608fad660826cbfe2482b
156 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and numerous external links point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=some+any+grammar PDF link annotation
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/dq8hnc1dfoo9sg57e892aa9e90/74317158386.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/47484825839.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/96099534417.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/lulatazo.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/enok6sjpcne39dbisop2sldavi/86568224279.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/8df148632f282774f8f33a47c5027343/wotazowubavasomobarosiza.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b28c9578f8a---49552379689.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/85309915340.pdfIn PDF document text
    • https://faprosid.com/file/jesilopesirawedu.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///tikekupumopu.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/woraduvusokukikurasur.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/64949407138.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/69404184042.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/fanofepevapaki.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bc33e6550---57746786380.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/kifabovezubijur.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/pezegenide.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/judunovizenenazowape.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1d713917b9a3fed3cd96a1fceda59792/natudatirizifotoxi.pdfIn PDF document text
    • http://kasargod.net/uploads/file/87579953765.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/97840180391.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607259085adb0---nanilenofopigifopifaro.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085da3abfd27---tevigasaguwil.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cdd69527e---kugadebixivuvuxumejodegi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 17016 bytes
SHA-256: 4f26869726e3f0072368839fe9c661d722c4f2792f651491252c53b66e26bd60
font_02_sfnt_off00012f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F55 10236 bytes
SHA-256: 8a1106e9b75d2dc2aca9b8265688b79b0d4e4b72c6014b08f84bf1fda28af6c3
font_03_sfnt_off0001464e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464E 16952 bytes
SHA-256: 8cb8e5af7a8cf382b6ae184b977086ab5d9f880f98176b2c33df97b6f59c63a4

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