Malicious PDF — malware analysis report

Static analysis result for SHA-256 f848abcbda068e02…

MALICIOUS

PDF

181.2 KB Created: 2021-06-30 11:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dac1479bc48f27ae5e57ef7ca7314b1c SHA-1: 4d85fd94e945906621a21ce018f8c1c82d40ff30 SHA-256: f848abcbda068e028d40caac77b7e0cc4b68b95d4b0d66bc094a32998205e3ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=both+in+swahili PDF link annotation
    • http://www.pattyn360.com/upload/forum/files/jiwejulopeduman.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/84966309310.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/88585992186.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/movuru.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9cfcbf2b4---48641628972.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/abb44eb99f4706875cc3bf98eef4b8bc/zedukowuxusapakaf.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/fbcd4a8483370e738665cba03a6a2418/xuwitadomekem.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d4efb8d91---rulijuwigokefikunav.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/b192dac1551d3fc10c33475f9819d159/mulunujepupobe.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/f5ffce3d6b71c0168cda4c7ded473476/60728782402.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/jusavusafoto.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d63024f2124---11910923557.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/74ac19083d6564ce949ba9a18dc3512c/33687163482.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/fizonoz.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/ruzozixa.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/j8ij4ukp2flpa9ffiebnccs8i2/70736818655.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/10cb4d452a720b30f28ed228535b73a3/79663763811.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/rasikodetujota.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096508bb298e---6473301706.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8e1ad0ea---89641024444.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7cf802857---wakidelide.pdfIn PDF document text
    • http://chinahongji.com/d/files/94064363869.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///56162275170.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/xakanew.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_off000266f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x266F3 10112 bytes
SHA-256: bba31a726f3ef9836f98e34dda3a881e96cb0a05cc3e910747a0b9d97e0499c2
font_01_sfnt_off00027d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27D86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00029598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29598 19180 bytes
SHA-256: ea179a15c8f854ee56c1968fe58b8a0eb6104ba0d08061b8c357b7bd4455f34c

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