Malicious PDF — malware analysis report

Static analysis result for SHA-256 b738aba9a2baaa0e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 02:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 235e8376619e6313ebff735f52e88bc5 SHA-1: bbb6f1d2cf578d5cedeaf26d6db928c89d41ecf4 SHA-256: b738aba9a2baaa0e76b398953118575927e51ecb27b89882f46ebe62c07b1acc
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, a common tactic for phishing or distributing further malware. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged it as malicious. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/1b6e1669d9144f1f5da474d88c6d0ffa/43502692954.pdf In PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/v8uq91t2vi3btudj3f04jd7tap/tajenizebewewufej.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/filewurenapedeso.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9fa9d9405---teluburi.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/5f2c10752ae55c8b26b9900252c1754d/matuvitegof.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/64922946320.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5290da6038---tanekinojibal.pdfIn PDF document text
    • https://12waktu.com/contents//files/keruruxiwenexugu.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/vepuxav.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bae75c20c972568540d930a7e579b0f6/tofasolowulugex.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/9jlak3lojg18q2bnksc5odjf5e/bofosegidepalebizer.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/zinaxoxanojejumos.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/76758259648.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/zapuzikoxegawojexedeg.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/tozifagudunoxoregaviwedem.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/64932661041.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/lakelul.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f99917cbedf---38412776055.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/vaxome.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/fotewunalokopixaxizabi.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/rukor.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610d12d9cc12e---42716338075.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/3e493bf2bdbacd0b87f4e7d48defe31d/nemedikamevofukikobipo.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/dabugemewudasetimodawi.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/xunago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bioavailability+of+vitamins+pdfPDF 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_off0000d22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22A 10800 bytes
SHA-256: f809728307ca491090f1431318a35f91a173e46457334cb043f7937ed0c86b03
font_01_sfnt_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 16988 bytes
SHA-256: 28aefad88c073af124b654ce75a94b5938160e14c9d764abfd0eb787adf67e04

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