Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fb8d5c4816d0ca…

MALICIOUS

PDF

83.0 KB Created: 2021-08-31 05:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d3436b2229d896f1fb2a0504c4be2dc SHA-1: 0fb57734d9dfa077e9ea284e88c7b28579c42153 SHA-256: 73fb8d5c4816d0caad2c06451e4a62f2ca3867686bb20597d2480a4e260e0585
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on potentially compromised or disposable hosting supports this assessment.

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://inwebjor.ru/uplcv?utm_term=spectroscopy+practice+problems+with+answers PDF link annotation
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9883p2dmvobiv24nuds44lr7m7/xitimupasubobijodixadera.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/28671022888.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/newez.pdfIn PDF document text
    • http://iworking.vn/uploads/files/matisawafop.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/19c60377004a9fdb6cd6a2451a7781c6/ronewoxodekuvagaselokabik.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160775bf88e183---visupugivo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/433a887f1757ff769aeb5ffe70a26bb8/99571257862.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/11386763601.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/62275237127.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/gulaguzinuloret.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79d38e877d---5200827442.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/8a783b24073319b3e8bf0aee1189833e/wejivebekotaki.pdfIn PDF document text
    • http://sdes.in/uploads/37027747442.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/61747129650.pdfIn PDF document text
    • http://belovosushi.ru/files/tozesupadijumow.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25b0db967b---xetafinu.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/cg4fijrimahsnkmkimu8o2f7rm/wagunolabemuju.pdfIn PDF document text
    • http://mebco.ru/images/file/5283350420.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/ligim.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160989fc6e8c37---82936980925.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/nedunuvitebef.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/dotozumozinekajafegej.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/11468271390526e547211040e36d2ddb/paxigapoj.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/70640677343.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_off0000ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 11052 bytes
SHA-256: cc9084f399f3248603560fc476124757ac6b64e884763121e0d1e17442226d45
font_01_sfnt_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F60 17908 bytes
SHA-256: de402b836ea6e84587d9398c4bb933b37ce59c4710dc536351974303df076593

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