Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5a959afe912342…

MALICIOUS

PDF

70.4 KB Created: 2021-10-06 01:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f2baa040e5cbb315df8f837c1112a3b2 SHA-1: 3c38e1d95ed364722eb41ba030ab73f017e1fa00 SHA-256: ba5a959afe912342f955fc622a185333aaa590528d1bd384646bd017cc017a3d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of ClamAV detection and ML classifier flagging strongly indicates malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL analysis point towards a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://aotwresort.info/ckfinder/userfiles/files/zodujakatavuxesujujiri.pdf In PDF document text
    • http://tbeaindia.com/userfiles/file/80265374114.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20211006003022.pdfIn PDF document text
    • http://raczcsalad.hu/files/70299769046.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/timemoginunamoduxagis.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/36207964172.pdfIn PDF document text
    • https://kopari.hu/files/file/63149057024.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/wisuzemuvurov.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614da74459ba4---ganiwuxexokeroxazaren.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/46662268444.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/fumev.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/87476089296.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161585a6264c20---26127502007.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/viburuxefapebaz.pdfIn PDF document text
    • https://svilia.restavracia02.com/userfiles/file/mobof.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/jususew.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/fajodorejisofizapagakepeb.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/309716285.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/sefigulofun.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/jizusafukumepanibofenaje.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb14cba99d---fuwopixigujo.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614511a672775---pobif.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/xezunusegujawugi.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/jelekerepizavodedosufotad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=snapchat+see+others+best+friendsPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/koworopeju.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_off0000b569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD80 10884 bytes
SHA-256: 7ebaf005e911f597d9ce7ecc3c3ee5d29d5f2bd0c16e7d89cb876b7ead7113f5
font_02_sfnt_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 15108 bytes
SHA-256: 14f8c5d1ce48c33246ff53f04e6a3b51ea59808398a7211057bb12c9d29523c4

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