Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf01b5dc9f1f4e3…

MALICIOUS

PDF

95.6 KB Created: 2021-08-01 04:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e748ac5e212e23cb440cf137a85f153b SHA-1: c228dee50039d5c94578a0b568d738b8b624fc81 SHA-256: adf01b5dc9f1f4e335e0c98095ea3848501c3399a3230e3a95ec72d1b32f6505
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or domains used for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the link farm heuristics and malware detection signatures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://ipllaser.in/uploads/5098185124.pdf In PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/21242501795.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ik8oetj2l6fq25guihus3h1ac0/71327077286.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a57da5dddc6---52746126463.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609180f2d9eef---58613375638.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/006e0b5f01e214621acc2324cc02ec71/7568914949.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jipiwox.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/90378364138.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a091990d840---revuw.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/joziduwasagutulorose.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/31030145552.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210707215506_n7ja9e.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ad871d05---sisikebapagiba.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/79484369597.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/45725412939.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/zekumunu.pdfIn PDF document text
    • https://arendic.cl/files/97348335442.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/54198187824.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/kasiriponorerabunoxifagaz.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c034b28ff6---populedamij.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210717084659.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/f4cac23b39924b9f466de5cb4b4eaa38/98236371450.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d52d982ebd---dimebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+is+a+good+typing+speed+for+programmersPDF 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_off00010c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7C 11008 bytes
SHA-256: da703a6bdf69862747364f630e45a287c8aad7106919a6b9a313b94a8465a4b0
font_01_sfnt_off000125ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BA 18456 bytes
SHA-256: 2b388a5979bdce2c36c22db8c522eb687fc06be80ce9decccb1ac98ded034643
font_02_sfnt_off00015717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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