Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4893bfba173fdc…

MALICIOUS

PDF

96.2 KB Created: 2021-07-25 20:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83e66c46c1aae00e095bf9a0d63730f0 SHA-1: 377fe948e2dd87262dc66ba99805ec28752cf772 SHA-256: 0c4893bfba173fdca75c5058d8308a52da099864d0c3778877081f61b204e28d
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting it's designed to lure users to malicious sites. The primary function appears to be acting as a link farm to distribute further malicious content or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://hanleyresources.com/images/kojevevevarudeb.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8879370c80b9c3ca52cfbd3403b89ac5/sovito.pdf
    • http://eviljoy.com/UserFiles/File/witejosifufojajuxewape.pdf
    • http://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/rajadunalowa.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d50b8f3abc---72250403374.pdf
    • https://fruzsiflame.hu/userfiles/file/21604605926.pdf
    • http://constantemails.com/userfiles/file/162537120123700334280.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f81220085c---xuvuka.pdf
    • https://vestol.bg/files/file/24633000684.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079f0377f7a9---77018153769.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n18h89h269pem5b56qeh880aj5/833612873.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5709c7063---pawarosopa.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/7462a8a32c35985469d56ba749dee7e8/5496900128.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/565cd08cbb9808f2df4be174da92c45d/mekuxiliviradowifijoj.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//75764504558.pdf
    • https://synersys.fr/contenu/file/48976283079.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc29c64549---60110943307.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a6e39dedf66b36fcafdee13fd1155ba4/11001127193.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2534d51eb5ce078e368740012c4d7275/biferadu.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b7166cd9---6063206819.pdf
    • https://inncredel.com/uploads/pegatetebiximirefepe.pdf
    • http://bethanybaptistcolumbus.org/clients/75549/File/dipakun.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4d5fecae4---73979290520.pdf
    • http://gernano.eu/gfx/userfiles/files/kapaborezonegapitile.pdf
    • http://gemwishrs.com/ckfinder/stones/files/65262243262.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ap+seminar+irr+examples+2018
    • 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_off00011423.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11423 16792 bytes
font_01_sfnt_off00012c3a.bin
414ee3628725bcaad96166b631ac69f779857769423c9ec85f80b587c6473cad
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3A 10780 bytes
font_02_sfnt_off00014517.bin
c0c9ea031a6c5a14a68f4b09442a230ae232b7b7b49bebc8c1daa724e828ca71
pdf-font-stream PDF embedded font (sfnt) at offset 0x14517 17320 bytes