Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3c883a240b7649…

MALICIOUS

PDF

88.1 KB Created: 2021-06-25 18:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8f46caaf2fe2dd79c8cfb2a27708465 SHA-1: 0d440958e96fbb846e09690afb4d5f74ad4dd074 SHA-256: 9c3c883a240b764912c16f7bf9a85a21a57f1540242b77f13b44079698bec739
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with a spearphishing attachment used to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://catamma.ru/uplcv?utm_term=vacate+notice+to+landlord+template
    • http://senseoftourism.dk/userfiles/file/sezog.pdf
    • http://ssaisarang.com/ckfinder/userfiles/files/17569070218.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16077843bbc566---11399755118.pdf
    • http://tafgambiatours.com/userfiles/file/bosofuvewom.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14b24a27d---degopabo.pdf
    • http://dashoernerboot.de/userfiles/juzugufidano.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba614f6fdae---57411093047.pdf
    • http://msiutilities.biz/documents/30234570072.pdf
    • https://daaeportrett.no/upload/file/88142235648.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/97615989490.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/tmvdetn09ot14bksua2ol6tm4a/31643310165.pdf
    • https://rmp-familienanzeigen.de/cms/files/meroteken.pdf
    • http://alexhofford.com/temp/files/file/jawum.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9e1cc0a51cd0c96f5406279447e33d0d/86026983394.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/3ff969a1d347d857b0e48ffbf29233f1/93622049739.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/89ce45c07635a3598435786b8c831bc5/nudimawupuritupaj.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/9abk0fgc08pl56v940ouhkr4cj/vituzota.pdf
    • https://biocoils.com/img/file/juxaduzot.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a886257d9f7---86097068976.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c5df316d15d284800786cd24aea7fa37/96269320440.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/winujonirinumisufurasatod.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/0219b2024a85ea4e459ca62db72d6db4/metirilojati.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/sf87ijnpsbc8mfd3bham2bvm3m/71352495521.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f66775f3ce72fabe08c66767a39aaa81/24593193225.pdf
    • http://ed-web.cz/userfilesfile/32965269212.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/c0bkcs003mnra2m6etouh3betk/mujevuzamesi.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_off0000f472.bin
1394b11cd10308d3623e02381abb61261b55073771eb904f1ca2285cd1dada3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 17264 bytes
font_01_sfnt_off00012172.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12172 16792 bytes
font_02_sfnt_off00013989.bin
50df2a09509f0b1d4ab37d415df5cd91267f8cefaf778a4f553bf8508f89e374
pdf-font-stream PDF embedded font (sfnt) at offset 0x13989 10476 bytes