Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8e389a14b846b7…

MALICIOUS

PDF

95.1 KB Created: 2021-09-12 23:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01dcd3e138ea9ccc480a68d74fd5e287 SHA-1: 6dcbd2c947b06322a804173037007dacf63c1679 SHA-256: ab8e389a14b846b721bd61aa4026cc1203a26e644f8bfc34892d1dfd1c5f7d36
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's part of a link farm designed to redirect users to compromised websites, likely for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick users into believing they need to download a password-protected archive, a common tactic to bypass gateway scanning. The presence of external URIs and links to compromised CMS uploads further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://huntic.ru/uplcv?utm_term=retirar+senha+android
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308e914d450---memesomunikukavosexe.pdf
    • http://rencontres-icare.org/userfiles/file/xigixitu.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/7ei4ihc6fb44sc9islbnrv0a7b/42789540710.pdf
    • https://rajaketiga.com/contents/files/xajaf.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161383d5a7fbc1---87993848246.pdf
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/ropete.pdf
    • http://studiosiriosrl.it/userfiles/files/jarawetikepufowuziwif.pdf
    • http://cafegreenwichvillage.com/uploads/files/66080650054.pdf
    • http://firegallery.ru/img/upload/66802651043.pdf
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/12596757528.pdf
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/zezexozadaluredimizota.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/djib31f7cd84jbo843igp9a4u7/wovufakebuna.pdf
    • https://www.studioline.ie/ckfinder/userfiles/files/7633660463.pdf
    • http://liveranigioielli.it/userfiles/files/19587971074.pdf
    • http://style4.allwebeasy.com/userfiles/files/vijopukez.pdf
    • http://rlangkhan.com/upload/userfiles/files/66240950684.pdf
    • http://birizgardenhotel.com/userfiles/file/60217751748.pdf
    • http://clairerolo.com/userfiles/file/58767092889.pdf
    • https://apc-algercentre.dz/ckfinder/userfiles/files/vinaxelosiras.pdf
    • http://keemunblacktea.cn/uploads/file/092313519568.pdf
    • http://talleresjpg.es/img/file/mobokuligul.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613219d2e72fd---forutuj.pdf
    • http://ottomaniantextile.com/userfiles/file/87920802271.pdf
    • http://pedraferro.com/files/files/83464296745.pdf
    • http://teplorium.su/userfiles/file/55327786902.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_off00010b16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B16 16792 bytes
font_01_sfnt_off00012328.bin
c6cef461dd396619174699fbb6f20e1234bad5ad786f8ac31aef8b313f227642
pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 21020 bytes
font_02_sfnt_off0001578d.bin
9d6892898f5b34d193127b58f17cfdf7a34e78c590a5fe5f89ab79d7bc6ed109
pdf-font-stream PDF embedded font (sfnt) at offset 0x1578D 10344 bytes