Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e213323913bef09…

MALICIOUS

PDF

95.2 KB Created: 2021-09-09 17:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3a6ad922e154705e7660b556926777c SHA-1: 3492e914eac006321047502f0132be7467106cc7 SHA-256: 9e213323913bef09a3124c4e954623005cf4c02baaed0769855f44872c3239da
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The PDF document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL targets suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://yilbasipromosyonu.com/userfiles/file/rilalexutivuwaxipuli.pdf In PDF document text
    • http://schodylux.pl/userfiles/file/faxefipazu.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/166154c1895a76ce985b6f6c83325fa7/sefutawozugar.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/72157853441.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/zolurapakazonemitu.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/gogewenewenonejedobi.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/wepekunixepuvenan.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/87093628393.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef119627ea---lutujufelinot.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/33747197929.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa7612f92---28870564789.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/36622938380.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/dojoferuxopapepo.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/latimix.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613654ec93c89---nogosadunopariwonini.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/kazuzeka.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/mujupanitud.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/tevanigavuluki.pdfIn PDF document text
    • http://askort.pl/Upload/file/gepajosejomazajatexokumi.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/73520566705.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/30390564410.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/sibidatopez.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/41900048746.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/41827933215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=best+android+app+for+live+footballPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000122e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x122E3 17572 bytes
SHA-256: 4bd7f4279ca0c880edbfeb9d426a21d36ad3b318bc46f1c71bfbf231ff5e5cb2
font_00_sfnt_off0000f4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 18080 bytes
SHA-256: ae39f197c442eddef82793e195bd5e84e00df0cf3406de73872ffeb985106854
font_02_sfnt_off00013db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB0 10748 bytes
SHA-256: e554b2ccf344810dc2f11db4695f3a8aef51e692943da66c73ed4c28e8ba6f41
font_03_sfnt_off00015657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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