Malicious PDF — malware analysis report

Static analysis result for SHA-256 336690f25383393d…

MALICIOUS

PDF

82.8 KB Created: 2021-08-31 04:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa6fb5d68852b112335ea6a1d309162c SHA-1: 6ca348cc86d1c9d461d5fd95a9123a9e022ec492 SHA-256: 336690f25383393daa3cf3de9f8bc1a39d6b0aea7cdf4264ab377b866bb81a51
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of numerous unknown URLs further supports its role as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://uptownfallschurch.com/uploads/files/xoralepudefafexonujebuni.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/12flj6hve7p2p16ltnd167b23q/lijigukulutolipafigovaf.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/51810524001.pdfIn PDF document text
    • http://primaneighbors.com/userimages/26045741516.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/tesowujadekumeponutolikut.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/lilomajujakofoxagoxisotem.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/rudevo.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/97879855417.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/43080315686.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210702_25F08CD266DC29B9.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160818e06067ee---bejosofezuzajizidulit.pdfIn PDF document text
    • https://stvorki.ru/files/file/wimugeg.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbfef21308---segub.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/38794318714.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160736adc805d8---rovezumamet.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/73659643300.pdfIn PDF document text
    • http://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/rasesikuranepaxobo.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/zemaxatazikodavolajup.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/xumarijanuvap.pdfIn PDF document text
    • http://anm-av.de/uploads/files/sepijezepoludusom.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/61833813015.pdfIn PDF document text
    • http://come2menorca.com/images/file/zevabe.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/77681297534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=my+head+is+flat+in+the+backPDF 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_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 10692 bytes
SHA-256: e94615482a184c335c4fb849c2cb1a84900e8dd95c4707b111a78dbf9c8d4b28
font_02_sfnt_off00010e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E34 18228 bytes
SHA-256: 03ea4773299a24246825477ac264ea52457d5a6f24c5096b258aa24668b4d99f