Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdd7c9a97af18bf…

MALICIOUS

PDF

91.0 KB Created: 2021-06-28 22:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b40772578584347eda505385f4ba45a3 SHA-1: 7dc23a2743c4b89cee900df51fc6c64c36695cd1 SHA-256: 3fdd7c9a97af18bf12d06c35684577a3e3dbffe688e1d5e2f27447318173b5e3
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 or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ci1q722ug9qh7j7168kf2naah7/32130207296.pdf
    • http://acril.ru/ufiles/files/gonusexarovuzifugegim.pdf
    • http://cdkkck.com/uploadfile/file/20210626111609.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160942b6abd0f5---49041022104.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5b71d70e---wikaja.pdf
    • http://uptownchantilly.com/uploads/files/84472091286.pdf
    • http://nedirajtebosnu.net/userfiles/file/xefodoxefewotosudofiro.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/98f8cefca5a493f2186f1b17fa52739b/3454890663.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4vg2fta3ke2ot2d0mcgp2l6bt0/44049973787.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/0gdr3u30f63sfs58or7b0u5rk5/8886445674.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/323b65a5dc7e76ae8d42712946b287b2/23175679287.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k6mqdggupckd41t1f7vhbe7r54/17177144747.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/19907930752.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/uv8nruokllv4k26fh8i0gfjpmv/zurovevirotuvekuganader.pdf
    • http://ggmtc.net/userfiles/files/sifipekuvav.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8e9410e0005d498afc39513ff3309ba5/merurinodurivasejijoteli.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/27703e2dadc1e462b77c5152000f5667/nabidekob.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/26883467252.pdf
    • https://gbagencement.fr/uploads/file/fegijaxofabukamifebi.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e3f1698a---goputifosumapi.pdf
    • https://its-bulgaria.bg/files/file/fekoraxiwaso.pdf
    • http://odpadykj.cz/UserFiles/File/fujowajasenipokode.pdf
    • http://asbufestival.com/uploads/FCK_files/file/33181601973.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=complete+the+second+conditional+sentences+with+the+correct+form+of+the+verbs+in+brackets
    • 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_off0000fab3.bin
6a7290762d5f165d758f2209099d10b0c81fbdf887b5e61c25d01978bf071c16
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 11300 bytes
font_01_sfnt_off000114e3.bin
9975c9a88cc460397d7a45bafd54b6a7337fd3663912e1adab24a1e8371493e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E3 18040 bytes
font_02_sfnt_off000142fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x142FD 16792 bytes