Malicious PDF — malware analysis report

Static analysis result for SHA-256 f428b71bab5a7e76…

MALICIOUS

PDF

93.8 KB Created: 2021-08-11 14:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4165d9128f387111e036840710f25bca SHA-1: 77859ea5f3e65e09b83b00723528ac0548c8f855 SHA-256: f428b71bab5a7e76eeeeeb170e7c8b012d64bc0399fe27c96961f1072c3a5f06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites, likely to distribute further malicious content. The presence of embedded URLs and the nature of the link farm suggest an attempt to phish for information or deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://bet-balance.com/userfiles/file/76083081793.pdf In PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ea07b56cd---xifutuzulilifojefubovuzo.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/93434431360ff6f8a1193a.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d50cdfb4e86---sitiketajava.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/30879363860.pdfIn PDF document text
    • http://betamarin.com/images/media/files/bitewijonoligepekam.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/65094819460.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a1b1e6fed---revujejisolebupap.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/86795761378.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d927ef3959---dedakupanezemivukopetuge.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5baae204b9dc4978df60dd16469c2143/tetirikunalalebuvovif.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162224895417.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/jibezapunenurapanifadupu.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/5cc3a7dabc5af15b1264b91e57de3960/jigidupubekogipaxiwoxinu.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/45314649172.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16098c37415de3---43618772245.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d90a14a59b---99810256636.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/25069959772.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/29554241640.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908e994810b---31802905844.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/64pa7oehp87hji2h0ecqhdsac3/69517569623.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/1076a9429291804509cb688453d7586a/10613052902.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/725c71ec0b3eb6d23dd0e1e12728a467/wolujif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hbo+max+promo+codePDF 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_off00010b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B45 10400 bytes
SHA-256: 00afdbf2e1ff0f8a3cd74c5334b1f5a27b0b16a873508bdb3ebac00928761315
font_01_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9F 18032 bytes
SHA-256: 3bef4bf3be623a410ec25dfad8619a484472bd0df76fa71117a8ce2eba5f3479

Open this report in the interactive analyzer, or submit your own file for analysis.