Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a80945b80ad6c65…

MALICIOUS

PDF

83.9 KB Created: 2021-06-30 06:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7884870fce1b13b47487ddf6cb6861ec SHA-1: 33cc33c3b24eeffba284e318dd62f1a910394031 SHA-256: 3a80945b80ad6c653802b5e21061432f9ada7e7170089b437023e751d0c6c554
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple domains, including compromised WordPress upload storage, which is a common tactic for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to exploit users or deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://accuratesearch.com/userfiles/file/tokedisokupariror.pdf
    • http://naucseto.cz/storage/gewizewefusa.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/e89e5f14caaf593896aa038979ee2bf5/tivawa.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb436ab7d6---97663727346.pdf
    • https://sfeerweter.nl/userfiles/files/29943128920.pdf
    • http://klpa.net/userData/board/file/8532638960.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/gnkgmte4ruv55o043lcc38jerq/69538545777.pdf
    • http://bpabv.nl/uploadfiles/file/muvuzojer.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b115ad8a9---jesudi.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/qnfcgrfn724lbdqt2kc5ekmu28/21578019459.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/q99hiqfm477ojtr83viq7pvre2/kawififobatip.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f914741704ad24d4fb6f963d3ea67db7/nilaxosafesinufowugozoke.pdf
    • http://thedewakohchang.com/image/upload/File/028361171.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076047149d48---pufudoxotisomasefanefusus.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873d528e636---93228888568.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16072753aec0ca---rarafemigenepelijaj.pdf
    • https://aplusadvance.com/naver_editor/data/file/38762856320.pdf
    • http://universalestetic.com/userfiles/file/golojiwave.pdf
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/42872103972.pdf
    • https://kurtoglumob.com/upload/file/97111830392.pdf
    • http://ahxxzx.com/userfiles/202105/file/xabami.pdf
    • http://csc0311.com/userfiles/file/20210624100407_ogcka9.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092bc009c6b5---vagab.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160986c357c704---fikafexupowiwudif.pdf
    • https://mosconi.net/userfiles/file/90064886838.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=martin+physical+pharmacy+free+download+pdf
    • 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_off0000e0ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 16792 bytes
font_01_sfnt_off0000f8c4.bin
be0fa201c3bd95e42f16cf296fe95b7f32b7feb0b513d41b492f5645a9280dd1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 11080 bytes
font_02_sfnt_off00011279.bin
aa79be296a98934808cb7229655b4db154135a894651927ea22554a3e43584ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x11279 17496 bytes