Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c829574d0e704d5…

MALICIOUS

PDF

80.0 KB Created: 2021-08-08 00:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 935c6002bb1a58d97f2b69aeb324f894 SHA-1: 74479f9fe5ef9797bdd9643526e3635a37f42b8f SHA-256: 2c829574d0e704d596afff30416ff5b9c50c7dbebe7a37c3facdfbd205db5e18
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for phishing or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://norrlandet.se/userfiles/file/bidubivufejamodalet.pdf In PDF document text
    • http://poltinik.ru/userfiles/file/28996360559.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e0c385779f1d7644d69b26294d0da305/37886143240.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/saxumunozuwuvijunaliga.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/kubivuzijataxajuzukabula.pdfIn PDF document text
    • http://ladue62.com/clients/2/2d/2d0487a90c18d3a1b3df44839405a665/File/fixerufijezujoladezuvi.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/22651535041.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/mopujixof.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/retuvexudoratabowim.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7eb4e9be8---64228153516.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/kasuponalupix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33e099dd50---balasoje.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/bosukedakenefetuguguvose.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/908886592ca636be92018395fb27418f/49541910372.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/cloqd7jnisfiumbb9uob0ebb6e/37018667211.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/56242495041.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5b250ea59---32468093098.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/juvaroretolijomumatanizi.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/3961673451.pdfIn PDF document text
    • https://ethnicacademy.com/userfiles/file/59626853090.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/81267823268.pdfIn PDF document text
    • http://clingac.com/d/files/34008905873.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/74350303221.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/sudelogotapofulerojugaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=my+cafe+cheat+codes+2020PDF 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_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 10580 bytes
SHA-256: f6ee3d2cc3738552cdca2869d2e3034ce0b85aad0c0f1ade7cd2529172eb7ba3
font_02_sfnt_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 16564 bytes
SHA-256: 5af9dc98557269417cc5930b63482f2a57758c14e5f3631d91dd3782de4a41a1

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