Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fef0c57f219d33…

MALICIOUS

PDF

75.5 KB Created: 2021-09-06 21:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3104a9108a52f37acb1a92f59c485982 SHA-1: 5dd59c9f8c2576a0210df731b51bc2745ff2918c SHA-256: 90fef0c57f219d33eef02afd96f9a489b3b00aa1a818637a1981c7450e69101e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of a link farm pointing to compromised or disposable hosting, as identified by PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, strongly suggests a phishing or malware distribution campaign. No scripts were extracted, but the document structure itself facilitates redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091305e0aac6---lubisetesifisujijuvok.pdf In PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ceb3c0ec91---wimiwi.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/51905891488.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/58009568236.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/janipufuf.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/vizomevajosetite.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/focd0un7j1uj843j0t6vh40cv6/88447313597.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/lixul.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/powisa.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c21680c5b2b---gejitoni.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/68905043500.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/buvor.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/21096271708.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/murifixitanuwef.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/86820272433.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/db747a1250u3dfbkjpdq8mhal5/68796610008.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/80574941181.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/63540667549.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/79292826406.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/7186225262.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/14958298442.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/3ebb0bc7972b5108c5e63766ff18f141/jikefaniwaje.pdfIn PDF document text
    • http://guowangcable.com/d/files/ganozafobafes.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/94772205553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=braithwaite+tank+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC520 17340 bytes
SHA-256: 9452f1caa78f343c1420c696ede2217816b0f3379e4c0eb00ec4aea477960af5
font_01_sfnt_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 10492 bytes
SHA-256: f537042acd52c3d6f84a2418ba67ab1590ca5612e339a0f38d64ecd9a936f511
font_02_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1