Malicious PDF — malware analysis report

Static analysis result for SHA-256 56961cc0319bcc44…

MALICIOUS

PDF

72.0 KB Created: 2021-09-04 15:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2cd17d79adead69d18dedefb906f5478 SHA-1: 4ad03347da5717a89dfb75b6bf92a31bd037aa86 SHA-256: 56961cc0319bcc44ab09292782e69621df209fbc8b85a6131da5ac38d80d117d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The document's structure and the presence of multiple external URIs suggest an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kalyna.ua/sites/default/files/userfiles/file/divonigifemegival.pdf In PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/g1rmev3dh556b42s9ekvek31e6/zugosuxop.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/noxujub.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd0b5be22---81373450669.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6ae86ec4599aa88cabc418cb8ccc4966/modebewekomadakujajof.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/fefomarasijurewomamim.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/56198180336.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/d24d1f18d5764f8911ca10b9d12a7472/larokemefanaxuzivasom.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/6804160056.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/13265058311.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f7634719e78fb75a7e24b0ca5d931a90/xerimifof.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/ludelewunisadesefazavo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160931061c53c3---xawuzedupilewo.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/zabutobefazegara.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/86744037199.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e8467478c---zojugotesudaxitejapuvex.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/0has3j0r3ve5iqkpp2un0gh222/javodapugelo.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/34360309913.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161130f80b0b76---43788337012.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/rimujaxinewunezikijuriga.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/52763276381.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1770c77b402a498bdb3a031337d3889e/dowavixozokexetekizejuda.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/ridusedinaxaruletesud.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/40206621226.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/38877035628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=addition+fractions+same+denominator+worksheetsPDF 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_off0000b616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB616 16596 bytes
SHA-256: 742a2d11277f23aeeb549d38f26d815f4404de990d7d197105c6471999299aa5
font_01_sfnt_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 10856 bytes
SHA-256: 69246dd56fb822a8408ec6a79ea3bfe834b38cc774dc2157eaf9297b2aeda362
font_02_sfnt_off0000fa0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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