Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38a8eb39f4c1147…

MALICIOUS

PDF

83.7 KB Created: 2021-07-19 21:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3151dce29cdc34ed8055c1570d9aef76 SHA-1: eed68e7ec8cc2205ed84a54b7e4cfb6c13f74120 SHA-256: a38a8eb39f4c1147354b0b84ca0813d84bdf186ecef57265a31812b7b2dd76bf
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aawyx.com/sites/default/imageuser/file/banatakasipedukomofijinob.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/ab25b7e2ae71bed3bdda9a91e2c2e787/wijofarenasazakedevivozig.pdf
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc4ff7aee4---79758610594.pdf
    • http://asbazainville.org/userfiles/file/kegikurajusidolu.pdf
    • http://moreit.ch/productinfo/file/zevuwesoruk.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61316e7e9b---66762021775.pdf
    • http://www.annaleehuber.com/content_files/file/jugewofapemoguto.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/logajodalagibefufirumobij.pdf
    • http://nusratali.com/userfiles/files/76867687772.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608274585f498---saxarug.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfa3a362fd---xuxapu.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607052e1a7494---78291203606.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c42311da11f---fibomobuvipugiviseposube.pdf
    • http://poorclarescork.ie/images/61261352898.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f4a26f337---25406148276.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b838b35166e---21464041934.pdf
    • https://a2designbg.com/userfiles/file/wubajuj.pdf
    • http://7166867.ru/ckfinder/userfiles/files/fixewipilu.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160981aedda90f---27273186591.pdf
    • http://kingalbertltd.com/uploadedfiles/file/44698547817.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070a35fb5ddd---63473293281.pdf
    • https://mttrasportisrl.it/dati/upload/file/pipufo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=difference+between+mb+and+mbps
    • 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_off0000e3bc.bin
10cecb1b508272d8ea0a519100bf7da1d5158db1f22fba118267c33f575831ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 17300 bytes
font_01_sfnt_off000110a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110A3 16792 bytes
font_02_sfnt_off000128ba.bin
b7e257124e34b60123a56ae89a70add89732e6a43b41094a83ee01b6a109bf86
pdf-font-stream PDF embedded font (sfnt) at offset 0x128BA 10840 bytes