Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0c6b4b1a620a7e…

MALICIOUS

PDF

80.7 KB Created: 2021-07-13 20:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6019f18e07bbf2acdf5a583fdaf3f32c SHA-1: ca1f4fed8b57fbf0e7a4a54b6bf872f65de9c526 SHA-256: eb0c6b4b1a620a7e720b46c89e4d38fb092008bda7da2f45db096d9f606c398a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aklond.com/UploadFilesfile///2021062301050766.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/lasew.pdf
    • http://thaiboxes.com/piceditor/file/deseninilesod.pdf
    • http://safeabortionnepal.com/userfiles/file/fadetu.pdf
    • https://fa-vietnam.com/webroot/img/files/71529350719.pdf
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vovugosowekube.pdf
    • https://stallion-international.com/userfiles/file/13474577115.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce31af489b3---zoferopov.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b6132929e189dd4182a38adc4ea5f073/21893548662.pdf
    • https://parc-hotel.info/file/worewikisosifipaf.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e51a1a107---22429336544.pdf
    • http://cerrutistudio.eu/userfiles/files/31832853526.pdf
    • http://partner-support.net/user_data/userfiles/files/52366846119.pdf
    • http://kameleonhastanc.hu/files/file/86766070429.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/78443097734.pdf
    • https://isosklo.cz/uploads/jifomasemigamus.pdf
    • http://adamlegal.com/userfiles/file/kawunolegiragelin.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a52be15a839f0b07fb28e6e3a8c349e3/gomojawapajowo.pdf
    • http://cy2hand.com/userfiles/96278561919.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/909d7506661e53a20850dfb530622008/15273042866.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160854fac20a74---65658204356.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa7fa5863---92586016783.pdf
    • http://fixafilm.se/userfiles/file/sakolejitudazelus.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=find+the+whole+from+a+percent+6th+grade
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d532.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD532 16792 bytes
font_01_sfnt_off0000ed49.bin
ac863a58459f3f7f0d3bc91f7465238f52ee96f55f26600171862548b93c91c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 11132 bytes
font_02_sfnt_off000106d9.bin
0f17d722eb02a1f41146e19e36204850a3f04a8ff2f026a0c699a941051217a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 17756 bytes