Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b182cac897d285b…

MALICIOUS

PDF

95.5 KB Created: 2021-08-13 08:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee84930c3a9d0c3797151ce0739beac4 SHA-1: 6f6273c070e6b7389e640aab39b51b73c047440f SHA-256: 8b182cac897d285bddbcfa2c7c6c872d9ac0ad4d2fcf5eddabaf11c9922b4251
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the true destination. The presence of external URIs and the overall structure strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://aftckwt.com/uploads/file/79413400152.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/xiwajiduduw.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b3fa8bb95---51656304669.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089a331b17e3---vurabijukutaxazeze.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/28683273031.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/enk76rhugjri5topt0oh87fuv7/53645844673.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/a1496466ab69b0457f0d417301e1a81e/wibefezunuvuvebilulije.pdf
    • http://ahlhy.com/uploads/file/240423546244.pdf
    • https://tekdalyapi.com/upload/ckfinder/files/45505900245.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ccd503862---jegosovasekuv.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/b5n3u9jpqeuc51m74qq2mm5hn4/82496966351.pdf
    • http://vanillasky-ch.com/images/files/95263998426.pdf
    • https://gegeny.hu/uploads/file/vujadineteruravemu.pdf
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/dewenorezojolu.pdf
    • http://kientrucnhacuagio.com/upload/files/76120513926.pdf
    • https://signika.pl/Upload/file/72390913439.pdf
    • http://congtydaihai.com/upload/files/87391244528.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/vk33aq05s38pdsmh30b7uf7jdm/simalamijulojaw.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a985a77bf06---bigoxatom.pdf
    • http://bryanhigh78.com/clients/72554/File/saxip.pdf
    • https://callmarkinvestments.com/callmark/files/28914524053.pdf
    • http://el-master.ru/userfiles/file/47493248051.pdf
    • http://agroanaliz.by/upload/editor/files/86154787672.pdf
    • https://faceless.me/userfiles/files/603043626.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=serial+number+for+adobe+acrobat+x+pro+10.0.0
    • 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_off00010f31.bin
aa8fcb784023c42ff070f2f5608f81ed3e6a60f4600c3621cc556d5786f6eef1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F31 11272 bytes
font_01_sfnt_off00012971.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12971 16792 bytes
font_02_sfnt_off00014183.bin
3eb5cb3faa75f380fce7c57c55c2fa0681904fde48c7505de67c03caa94b53fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x14183 17832 bytes