Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b5147e2304864d…

MALICIOUS

PDF

82.4 KB Created: 2021-10-16 02:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7132d3b6bbba895c4128ab402f9b6100 SHA-1: 7e3479a0e71bec0a1d885d46e01d965cb1344c26 SHA-256: c9b5147e2304864dd86045a47c54789befff60d32d10a4300a75bf8b46df16bd
164 Risk Score

Malware Insights

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

The file is identified as malicious by a ML classifier and ClamAV, with multiple heuristics indicating it functions as a link farm. Several extracted URLs point to compromised WordPress installations or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing detailed content analysis, but the overall structure and URL findings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://drafthe.ru/uplcv?utm_term=altons+finest+chimney+sweep PDF link annotation
    • http://hongshengfish.com/uploadfiles/2021091408495085001.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/698325792.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/86749721374.pdfIn PDF document text
    • https://vzduchotechnickefiltry.cz/docs/21089247279.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/jimivaxobovesita.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/gonuzogorisufo.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/lawekutaxojede.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/0r1t6fl69e44ppll3hg2v3rs8b/64863872546.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202110011244583510.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lomuzamipebejonobuna.pdfIn PDF document text
    • http://bigbulkbags.com/survey/userfiles/files/tikepokogusobe.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/75796182039.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/gosixawitijavafebewo.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613487b8de0ba---jawonusolig.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8b6c127323601bf4994c935f29bb3909/10264831605.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/94731556996.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/0b804ae097e250aabab6a7f456021110/gidapi.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/zawoxagiruduv.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/56573379396.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/susoluseworunakaxusol.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/25146975676.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615146377a729---99176741915.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/36324030231.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/gibudopumez.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_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 10664 bytes
SHA-256: 696be792b78e42f285b2a0da5970a2315406f67d8b9e529ab40bc790d8f3443c
font_01_sfnt_off0000f43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 18556 bytes
SHA-256: 5689116dc51342ac682acc56bb99e9c7c62254643b6191f8a49848c77ae2e959
font_02_sfnt_off000123e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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