Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c195fa8ba3f622…

MALICIOUS

PDF

88.3 KB Created: 2021-07-26 12:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e6037e71a38419d55a87e1295c1c2922 SHA-1: a3ffa6aba57f4bf62623ec1f1bf0582dfdff59ff SHA-256: 90c195fa8ba3f622032777d0ef6251184431c4deadc915815e0c999d676d1bab
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload locations and disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of numerous unknown URLs suggests an attempt to obscure the ultimate destination or to spread across multiple compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b291a3c70fb---xuxutozuxaponuwedozajoda.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b502cc57---92510341485.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a5b3d6aaf---9961490435.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/31150297521.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/26b57c5a3d0cf15f0f8c7d634e414efe/suvogokijivip.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/xaxexoli.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/95289654527.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/59692514703.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e72e24b6aa---30995289646.pdfIn PDF document text
    • https://avvocatoboretti.com/file/zivapatut.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/jozemafelonimaguwur.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/hd6p2e1udjp40632uj6jefu97v/totujafojawutusogozap.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/b9555eac46343b4bfce3f598ce44de57/48680373092.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608719b2a9a4c---babave.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/foduxovitu.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/2302280435.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/6296865103.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a27409e7182a5b5ad53a0e5d3ee98aaa/ripazevirar.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812782bdf22---sulikiwizetigisogelakemix.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37dfd6f561---zajej.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4662bbd42---lideketapu.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/1mbr613l8k8lm4fcs628a4nnh7/6556915750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=macrame+knots+instructions+for+braceletsPDF 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_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 10824 bytes
SHA-256: f198b665f98396905f8e0090d03c35c9aab704de85acd82ccc60b1c336a4d477
font_01_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12364 18100 bytes
SHA-256: 863dd20cb53a8292c091afaaafdf6056a0fc2e86c4b01663488cc8f1c5e48222

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