Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4213446e82f1968…

MALICIOUS

PDF

91.8 KB Created: 2021-08-04 04:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 568f98fb4b137c84870d336e4d782a6b SHA-1: b7d31335d7c84aa42c701dc024963c21a65ce553 SHA-256: f4213446e82f19685ce3e48fb8b66cbe61b76fb9575a7bc4a4ef1fe6bf7f687c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://wickedcheesy.com/images/file/sagepoxikuwasategu.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f850bc7c4---90734696786.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/rujojaleborupazadesuk.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/36540998657.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/38968130469.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/53136330085.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c128c06bfb6---66586556108.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23cc6bd16---74590491739.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/51763773865.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/31405836316.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/71246764297.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070295ce0bae---12827955943.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fad3ad450c4---vexalar.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ac7fa6110---zedadegujeme.pdfIn PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/59089487633.pdfIn PDF document text
    • http://skisun.it/userfiles/files/kumikumufidorixemedimope.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/5300577309.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/23848951964.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/fuwer.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac03b448b---xesazuzujaxewat.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a3025912a---perorivoral.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa61350e3de---90937272595.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/a0f013p2b27gqsr37ugqmtfj23/lekimosep.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/722f3af2de23418bd67e6120a8551ae2/kotisagofebaxizapeteg.pdfIn PDF document text
    • http://webursitet.org/Files/file/kulusamumotokabaniruvod.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/80410028321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+channel+is+cw+on+optimum+in+long+islandPDF 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_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 18572 bytes
SHA-256: 757eb897d9470b8c673f97b4dea5fbb4253f4dd88de0d7a3faa4ed15c9d1c2c9
font_01_sfnt_off00012f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F91 11040 bytes
SHA-256: fdaefae96349d817d7fee0ce2727692d9e0b15d2c2198e57338fe0ec55c7691e
font_02_sfnt_off000148eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1