Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50c4c76b864bc2f…

MALICIOUS

PDF

88.1 KB Created: 2021-07-03 11:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 066bc1fb8fff53f9cbe18c0c11ab83d5 SHA-1: 09ab386bb86461a01efb256690bbe944e8413b68 SHA-256: a50c4c76b864bc2f5c82206e04c0661102e48f2c6f3f7e48a06c59e3cf06d742
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of links pointing to various domains, many of which are identified as compromised or disposable hosting. This structure strongly suggests a link farm designed to redirect users to potentially malicious content or phishing sites. The ML classifier and ClamAV detection further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://zuche0551.com/upload/file/78936394241.pdf In PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1cf89ded---46345918304.pdfIn PDF document text
    • http://aplus.to/userfiles/file/49524849971.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/vovajavagufikotu.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56f1da5525---pedoxujevetusudopozan.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/26326525091.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1869d1eab9346129d4a771c299923580/vaferuwed.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/zagejibirojevo.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/31149911293.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb9edcb098---15595813969.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/pirupu.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/febusuva.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/45583511710.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f850432ed5---bipof.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aea7ad829a---zoxariwutakegesejopali.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d894cc2379838a47833320d8b41f8203/2128295254.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/g3ibqgkt49t3td1usv9f4o7ktv/xopopi.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8a5994b7b63c8247335a0fd806491cba/71238644509.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/lijijowaguwolusaja.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/912381586b2d3964be0e47aa0c4fcea5/86928806461.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c903bf9a79f---71933852534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=5+hyphenated+compound+wordsPDF 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_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 17380 bytes
SHA-256: 2ecca0182e0c726e2b1c1e8c40c8d6fbed14a230f8eb4697e7b7f343189f28e4
font_01_sfnt_off00012047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 10980 bytes
SHA-256: c2feb6d0cb50871ce5a8b3e17635bb262cc3ff6e68437df827080f0f8c5db49e
font_02_sfnt_off000139ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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