Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3961aac9f7cc8c…

MALICIOUS

PDF

90.9 KB Created: 2021-06-25 20:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d4198ed13da036d1c3074ba51bd17e78 SHA-1: 7395438869fd69185f4a8d7a606893bb360c7162 SHA-256: 5c3961aac9f7cc8c591c84987fe9212934f40219dcfe898cc62110e6ac91b4cc
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://ruresept.ru/files/file/42074639608.pdf In PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c2740307f5da18f32c3943fa3a206e6b/wilor.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/787cc6b2638b8fda7c0ac5f4924bc71f/bipikilubazofabakewogiko.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608798e52006b---60476913216.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/turoturifajuk.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/5678293729.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/37272556167.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/2166316051.pdfIn PDF document text
    • https://okvino.it/file/wuxowepewazetozirawomu.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/87935457845.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b05cc1a5f3b---12124776314.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/6ad744ec81e5f14d183d38149ac82ec2/wukumesobadetukiwinomij.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093f2ad6f18f---demivi.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/8d445f1c8bf4f2cb994a9dda7754d2f1/97303474792.pdfIn PDF document text
    • https://ovalpolycoats.com/media/8098232646.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/947cc5bebe4ec16dd8a9cbf36884346e/xofabovijuna.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607934533833f---20308629193.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56ad4c961a---dobinagodomava.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/d734sgqtbai87m146noobgusba/totimitaleme.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/4938465922.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741e2e18ad3---mujipazala.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/pimajetijosivuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=r+in+action+3rd+edition+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 17296 bytes
SHA-256: dbaf7498cce80732cadf9b173fd113547a33d6bfc57ac27e969db38f508b0b42
font_01_sfnt_off00012c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 10616 bytes
SHA-256: 8fc8ecea1a158640063610e2eb4b19981406c8c3c631ef526a2b4459fcadf3b6
font_02_sfnt_off000144c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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