Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0867fc15fb60172…

MALICIOUS

PDF

102.8 KB Created: 2021-08-22 13:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6cd3937320573f43da4519fe6e04fc1b SHA-1: c3ab178f085b28a01c0ba20300dc53e2a340fd9b SHA-256: c0867fc15fb60172ca406006775e50f491f44fbd0e2567b2b50f1983d49b25da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9a9107a98---gonubikimezimeza.pdf In PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d453b49859e---zaxabamudutaluxekelopem.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/ej0i2ti6cifv4sle5ekmlbajtc/19661977777.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/kijugop.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/58524461267.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/savuvifokifadasexevuw.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b307d71ed62---firefexasenosetumuvufel.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608918381eb42---xatafalemaloweve.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dea66b2cf997b6f28fcdd6544552935d/74597283758.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608683a2d3cf3---nezagotolarajugurulapena.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/21d1507af40886191c2c35141ec616b8/mugabegixa.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20c2dd2b6b---80056984298.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a80dc621e49---fetapalatevulogidip.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/vogabapemosemuzabixoweda.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/q562b8jv6fhmjhhm496qt64op8/lemesurati.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b714e444f0---vitig.pdfIn PDF document text
    • http://centromp.it/userfiles/files/63054787216.pdfIn PDF document text
    • http://zzquansu.cn/d/files/xitikadanitowusogodizogij.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/gatabimuwoki.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/pnphucu9oekekv9185k8p53673/36727017450.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/dfee3929916fbfc6bc8365965878162a/67798254176.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/buwudenajomu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b97a22a49---bakomevokirujavafiju.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8deed28937---teredujilukexolewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=excel+module+3+sam+exam+answers+quizletPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000137b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B6 3860 bytes
SHA-256: 8a068a41306b57372ea9ca093dca6346701d5e0eafc09ef704bab22912d8a8c2
font_02_sfnt_off000146df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DF 17300 bytes
SHA-256: b3f86d0c65233b0e427ee26abfa46b7bb4d9e649642166019db416b1a3e0b2c2
font_03_sfnt_off000173ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173AE 11180 bytes
SHA-256: 430409601a27b0b8f938c61e29d9f6285b3bffa4c2395f1ef92329afc3a06911