Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e97b6eb661a6132…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 21:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f72e7907067e192b5c31b86e39277329 SHA-1: ae076feff631828bf344fe79686ae784f108c6da SHA-256: 9e97b6eb661a6132369147c206bfaf2fdfad7f0c19aaf039f7904d6f50808d9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=grade+3+spelling+words+pdf PDF link annotation
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070cf2334b8f---buwuxima.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/53016938617.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/611dl1bvl73gmo2cbnnqjgvaav/zabufutiwiju.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e6478f6be---jenoj.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/70cb5bf01fb7989692ae72ec5682cb0f/57372329524.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/41461244189.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/7579017095.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa18e0bb3---xamawiwij.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/79966487322.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a360dcbc728---setifevivopasiwave.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/pigisekolejo.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/4784541423.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f775ab607---bivasen.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/394404f83eaec8e2578bf3548a781841/dapurajamikotukaja.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/69711275599.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/pemajenegamunobiwepud.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/jikefiputaf.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160838790a44b6---45273210367.pdfIn PDF document text
    • http://islandpointfl.com/userimages/fesatot.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/34b8148fd13282b42ed66d736f9d22dc/zipuradegavasitigu.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e70eae189fa---fofenuxobudagasone.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/b5a4f5983f602079eccc81666dab5cc4/votexujufuzuxir.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/zajaduzepekiredurukevukon.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/luwilapesorufonutapax.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_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 10872 bytes
SHA-256: 99b1c3f1a978ad3dc9a32a6d8bf9c9d60fa3e463035d5fae8469a22484477b0a
font_02_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 18684 bytes
SHA-256: 1b55966218bba6e283bc07d5974e837cc719982c3cffab63a27eb59c9ac70d09

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