Malicious PDF — malware analysis report

Static analysis result for SHA-256 01df22a682badd3b…

MALICIOUS

PDF

88.2 KB Created: 2021-09-12 03:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7de74c646845e5b918bfe0452a9f6cd8 SHA-1: bb4d3219657495ea2e945da96ceba27f31cbb045 SHA-256: 01df22a682badd3b0e9a262eca34d5058613e7947e34968dd0c0a692ae5065d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=living+science+physics+class+8+pdf PDF link annotation
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613853f5898ae---88580013092.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/pefipuxoxo.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/37508886385.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b29f589ee1---65099237075.pdfIn PDF document text
    • https://kawanmto.info/contents/files/70141803694.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/def084306eb13f203de9c2767318ff0e/80352235635.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/7148952034.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/5615166101e833323629c0eae13f0a55/ruverojonagib.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/sizadupapiri.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375934cdc22---12139363595.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/53557429457.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/6895829057.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c5397c41c15427639ae5a6ac620e47e2/99753018362.pdfIn PDF document text
    • https://aitalk.vn/upload/files/vojupizodi.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/xawivemugomanematis.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613477b6a00cd---99189414540.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613297b9acda7---notunawotupirixu.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210905152422.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210911_070907.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/48502696997.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/53156048350.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/29216776574.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/xusaza.pdfIn PDF document text
    • https://eklyps.net/images/file/26010683334.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161317eecf347b---10507124046.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_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 10928 bytes
SHA-256: 5c79a501c33d6bfd120f6c565c9a6f7da0dd1d5cbf03580aaa036e2d4a5ff3b7
font_01_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 18536 bytes
SHA-256: 7a8d857c2f8229afe227ba00c95092c307ac3a1549b2171478cfae49ef9f2c19

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