Malicious PDF — malware analysis report

Static analysis result for SHA-256 71863554cd52849d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 12:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e2769f3548d7c433563e42bf18a3fd1 SHA-1: e605c5e491571a1d39cb51680879ef2a2ed1aef7 SHA-256: 71863554cd52849d0caa2ae09e0dbcb53f8b6ef9c4243b70c45d97bcbb6b646f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec4839ffd3---sagawozexa.pdf In PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/f817a23f0257673fe69eadb032deb7c2/964959369.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/dufuxetidoz.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/javakadusiputod.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/widevidalufiriwipararu.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/boxobasitibukiba.pdfIn PDF document text
    • http://electric-kernbichler.at/laviweka.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/jefosusifeluteraxulibup.pdfIn PDF document text
    • https://alkoplast.rs/files/61365812681.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/74594230041.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/mubetuvizofiro.pdfIn PDF document text
    • http://enricobarraco.com/files/runiloxoperosazeduvu.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/sisibejukowujodudunupip.pdfIn PDF document text
    • https://guijek.com/userfiles/file/lorabof.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/fa209f6f362c2b7281d8ba860f5e3b78/dorutujageveminomuw.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/97403060244.pdfIn PDF document text
    • https://ekransamara.ru/files/pagedadalefagikakisune.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a795a6527---9669765033.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/60807418312.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/xikabovev.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/vikidozujidozutoremelod.pdfIn PDF document text
    • https://le27.fr/docs/file/lotinajeluwarexavem.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/32160991005.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/lobiwotezusurewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=screen+capture+shortcut+apkPDF 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_off0000db96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB96 18424 bytes
SHA-256: 0d9d65063c2b879afe84cb4e41548f08835567381acdd5d4f60069e1188b6bef
font_01_sfnt_off00010b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4F 10600 bytes
SHA-256: eb4bf3828a13c91cb08670f1f89b6c13801024019315979759e27d04ee2e6a47
font_02_sfnt_off0001237b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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