Malicious PDF — malware analysis report

Static analysis result for SHA-256 a906570345c2ab2e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 21:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0516b0646c32e2412dd051c4f0ff106 SHA-1: ab081c3842112cd349e3d2b67b42ad4eca9e098e SHA-256: a906570345c2ab2ef0ec74ba80b3996c97aea666d333ca3d6002f4d3b3cd6bc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://allytemp.ru/uplcv?utm_term=hcf+of+two+numbers+examples PDF link annotation
    • http://izhar-energy.com/userfiles/file/23792168633.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/taxisana.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/90652596212.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fced5dab936---binaniwul.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/93a1ec7d3f5f708e1c4b542a23f111be/82719432508.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/60310842279.pdfIn PDF document text
    • http://glttek.com/userfiles/file/tofupilaguvuluzuxagununas.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fda0df298a6---70851731672.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/cck4fuce470093at6s37cuiivs/netulevuninokobejunobal.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2ea07c0c2---98004988421.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/jodavupukunipurig.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/37022064941.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609da9f1717d7---24838325562.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/6d7949ced3e4ba0286953a76db84ccc9/8297568678.pdfIn PDF document text
    • http://cloverdiamond.com/file/fuvojak.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/losurivavoxo.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/sewururajo.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/1638f85c161b9d5042deb4400b4e9b56/88036168201.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6116f9f8b0---xokiwajuvufezasesi.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/40938336783.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/732e01b6e8dbdb58c56318a166fe8abd/gawesigaxalu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e5c50be42---53428639499.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/18871352727.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/2781268490.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/fuvojodan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 10968 bytes
SHA-256: 8a721a937b3775fb2c2640714f68454b88ef4d4dc6db96ad63431026b6058e2c
font_02_sfnt_off000111ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111ED 18328 bytes
SHA-256: 0354122b9e498b5e48b1457a79bd79783af67e6a6c367dac43f0195f3841ca03

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