Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f0754306b9b91f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-14 03:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd892cea5c47466e476a53fdec07c556 SHA-1: 09ce0feaa1fef4750f3d051a66b3fc7357a4adb4 SHA-256: 67f0754306b9b91f0f281286253b0a263c1c78cb6c3ea016ed629b1f3777fc96
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. The PDF's structure and embedded links suggest an attempt to lure users to external resources, likely for phishing or to download further malicious content. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d982e0a753---jujawaxenupolegip.pdf In PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/zexiwoguneliwu.pdfIn PDF document text
    • https://umutfm.com/resimler/files/60534315906.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/sejilar.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/pijiravemorini.pdfIn PDF document text
    • http://koddous.com/userfiles/file/60868755390.pdfIn PDF document text
    • http://ihdbd.org/upload/files/80146818408.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/32059091194.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/17194248532.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/80876590405.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/49510503043.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/16095292342.pdfIn PDF document text
    • https://edgecs.com/documents/8145313233.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350786e7e6d---81343786254.pdfIn PDF document text
    • http://fullx.net/files/betowo.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/fakavoxavelow.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/logisilevaluto.pdfIn PDF document text
    • https://digireg.nz/upload/polowuleditiwafiberute.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/55433271689.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161321dd94713c---bonoduzopufevoriradapexi.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/gujov.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/46050088944.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/disabor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tubemate+app+for+androidPDF 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_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 18056 bytes
SHA-256: 5f1e21caa8267209fa22ff91c300a1947a96d98d9e2ed66234f1537950123e0f
font_01_sfnt_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 10648 bytes
SHA-256: fd60e9ab4f4730f033c2e8b5759a7e4ddfdd30a4b11b46845d674427e6102134
font_02_sfnt_off00012d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1