Malicious PDF — malware analysis report

Static analysis result for SHA-256 16de9c56c0165c4b…

MALICIOUS

PDF

90.3 KB Created: 2021-09-06 08:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb257655cbd6a0f871f543aea7d48bec SHA-1: 9199de333a80a6bc049ab90235fff2c31b874ce2 SHA-256: 16de9c56c0165c4bc9a9cd344eb231dd3b0b8391ff01859e363f4a4739966679
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites. These links likely serve as a lure to download further malicious content or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/0d909143d7ebfd79749fbd5dcb312dc0/tepewakake.pdf In PDF document text
    • http://vitanova-cattery.com/upload/file/fagobupegaw.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/jexusi.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/zaguxipeziwasozufavi.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/tikajixukuluwavil.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cceafbfa33---jisigabi.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/233e6cb5a015b96ccc38efcc865b4dc4/37055390881.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/53139103751.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/rcpvbuj1n5edon2ruume098on0/22225905539.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/buzikabepebarovivuvopot.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/8003f31dff9bf3764bfc835a29e4edcb/wudutatigeli.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609a364798d1e---vevudu.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/25256464124.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096b4a2cffe8---96123975203.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/51384777628.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/97912642825.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/1338974844.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/wafalirunotibisamizovijan.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/77984413262.pdfIn PDF document text
    • http://benrassam.com/uploads/files/gitobatarejatom.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/noganidalefijusozevuso.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5af6488925---60391572521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=adobe+pdf+reader+portable+espa%C3%B1olPDF 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_off0000fa74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 10620 bytes
SHA-256: 27eb7a20df4b9afb32fbc11dc1b45ed08066458bf9ffdb01ffcddeb4929af573
font_01_sfnt_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 18128 bytes
SHA-256: 26c90b956645e1698a1d8dfec2fb2f1ac7d284bdb788eb24786024731940ec2d
font_02_sfnt_off00014177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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