Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e8b75511cedcf7…

MALICIOUS

PDF

91.8 KB Created: 2021-06-28 04:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 734ddbab5697d28efe4069cfba765ce7 SHA-1: b8aaab115b26cba22e1f94c8f64007ac04c00b2b SHA-256: e1e8b75511cedcf7eb988105fb4d444d57bd5dc9c96ac0e8408037a0947f4869
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The presence of a 'password-protected archive lure' heuristic suggests the document is designed to trick users into believing they need to decrypt a payload, likely to bypass gateway scanning. Multiple URLs hosted on compromised WordPress sites further support the malicious intent, potentially serving as download locations for secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=accidentally+deleted+instagram+message+request
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608192017ab51---zaritir.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb9eebc896---wogufejuvegidotox.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a97815968---mububo.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7f1c1bde9---80667745537.pdf
    • https://elnativocoffee.com/silver/upload/files/wimewejibavoxufusugirase.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/af47bb6bfd8fb7f2049e1f6ed71a71ef/10179554707.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d25a70db9---tikefofemega.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/baea3077fc6f9edf16e1f320244bd348/kugudiwajosar.pdf
    • https://arhometutor.com/userfiles/file/76748704870.pdf
    • http://www.alfapilates.pl/upload/file/tezaletaxesox.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/23n75888n59voavcmj05f0dikt/19418909044.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/paninewewot.pdf
    • http://siembra.me/uploads/files/74902285655.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d580fa9f9e---40169725302.pdf
    • http://rollfactorytogo.com/uploads/files/wowalawa.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/85770e91616b4d813a88a285b7783a84/sagosefi.pdf
    • http://amuseonline.com/absite/userfiles/file/kavid.pdf
    • https://textosolutionslinguistiques.ca/upload/editor/file/65418752645.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/61af6bto9ikk2eeednimiq8dn6/joxuzuvuzodaxamibutopuxi.pdf
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/18de24b473c0671339707f777e75973c/70400374031.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/37132294677.pdf
    • http://dailygiasi.com/uploads/userfiles/file/59843138593.pdf
    • http://bluecars.pl/userfiles/file/belovu.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/xalojaxodazosetomiwuniw.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_off0000fc53.bin
c1061a1280959105a71010abaceedd69a911fc93fd042df5ec1dd51ff17c031c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 10936 bytes
font_01_sfnt_off0001152c.bin
8a1fd881af635fea5d6670c2f72679e75a01043aeee106739d4d5808997a793c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1152C 19736 bytes
font_02_sfnt_off0001477e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1477E 16792 bytes