Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d174b750a2f610…

MALICIOUS

PDF

92.6 KB Created: 2021-08-05 17:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 37307e8f1c298cb342285c9fdd0919c0 SHA-1: 4e02e20448ac991311c54bac5880375092d01e66 SHA-256: b4d174b750a2f610dba3f971a55b65c8b805c69fb507b7edca2aca69e5107d9b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised websites. The presence of numerous links on disposable or compromised hosting suggests an attempt to distribute phishing content or potentially lead users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/2189555042.pdf In PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/midugolofegegobuzowidadas.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2942fadae2---pebaxu.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/15ca791601f4c7b8a975ca3e75fbb75c/46270811492.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/78301744354.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/16666387856.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/34727036104.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021516628342148.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/p7t43rcavlmg7hvinfsqhlmvf1/67409898820.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d8091d0692023059a32bd03825886b4b/divuxavodobolo.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/0d0efe64d8d5d80e25cc3da3172192fe/vitatebazoxonuzanato.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/borarixapabanul.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/3467911575.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b55d2681ce---guxanenolapemofewiga.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-28/20210528000924985796.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/binikexujinipibik.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/tifotedumuw.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/pojikaxifemixa.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/nokizijevosax.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da08d8a96c8---75790526975.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/56698678265.pdfIn PDF document text
    • https://aashianarealty.com/file/51838099400.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/rujejazewofudumoxote.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/valorozonijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+get+real+time+quotes+on+thinkorswim+appPDF 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_off0001046d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7F 17832 bytes
SHA-256: 6d4cefac92c748b949d652191228dfe4628c645c65cd7d6885711ff2dd1ce5e1
font_02_sfnt_off00014b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7C 11116 bytes
SHA-256: 50b432288e4904ffe2d514d86f637f662dcb397d53cd1bcd0f05e3ba7f72d461