Malicious PDF — malware analysis report

Static analysis result for SHA-256 7def4e86cf576c15…

MALICIOUS

PDF

85.6 KB Created: 2021-06-30 17:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 61680e8da39383e71dedeb2fee8b92fa SHA-1: 2ae33043ec6873b1d09f3f80acad363056d42c3e SHA-256: 7def4e86cf576c15bac2abf5375f9e854103af314565a5c59a3225e0efc83388
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery. No scripts were extracted, but the presence of multiple URLs and heuristic firings related to link farms and compromised uploads points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://synerhu.ru/uplcv?utm_term=tyre+manufacturing+process+pdf PDF link annotation
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4d197ed84---telojumosebifog.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/511132082478703542213ca9539fd265/jorulefoxadepawukabuva.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/4nht62j96st46b8e61r41kcc3a/82121770036.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/67014293940.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c13877fba---43587910174.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/2197844784.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/26106655262.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/009l8a72683vj0lht3a1kulpa8/pibadelomi.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c5739029bb2---mulirulaxo.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/24251263709.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/96072539997.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c77941ccc---82703589204.pdfIn PDF document text
    • http://aimic.com/userfiles/file/zilamidanopulikotukow.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/5d42432d6ed12cfa220831d5b2547c09/58723679301.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889b39be5d9---watajejomat.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609677fc37d07---27231875222.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/45350710977.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/16586503572.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/77108136010.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/jkukglmsknmagmnf2r9fgv80e2/23221874809.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad196efaf---31886950002.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fisosepubikejof.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/f88bae1be8cc2ad9a848b6b5406487e5/96483144124.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/31981320183.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/rejifane.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/f268975f9039b2f472ece014d0987b25/veluguvuwujum.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 11092 bytes
SHA-256: f299e09a2db6a8849775e135d14cbad56a149d50e235dc785f8ffd2c55143a7d
font_01_sfnt_off00010718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 16272 bytes
SHA-256: 86dae926cd9715ff2e5cc66640aabf5fd625b69ee284ef0681f2eacdba045ab5
font_02_sfnt_off00013111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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