Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf78295433af7b2…

MALICIOUS

PDF

116.3 KB Created: 2021-07-14 04:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7c85f1a4c72bfcfaeaa98904e37cef52 SHA-1: a9f51207768579b47988b8bd67ff391929d4e463 SHA-256: 7cf78295433af7b239673f24e76cbd5acf6b5766862ec1a5a5c52aec05a0124f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting, likely serving as a lure for phishing or malware delivery. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=m25+toll+charge PDF link annotation
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad35459f98---boduxolunuwilozipi.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/lipoxowozeb.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf2b94ebfe---22811774926.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4d49ae194---18770977826.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/3d4e0a5b4959fe3b197dc6296f92c3f5/72053654997.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/tutod.pdfIn PDF document text
    • http://bertolinacare.it/file/zevura.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec25c425b---61447618703.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b23dc2b84c7---31296952882.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/katorufus.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8da1343742---25941009871.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/43143947448.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b9b28d0bd---satatu.pdfIn PDF document text
    • http://ipllaser.in/uploads/majilosiruf.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b20ca1ec1---pibomeboxowevevexavevalil.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607238a942f11---44733614054.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/40039935124.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16083733f7bce7---17440360236.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/16daf9cf53dc39bd4ec70f569ec0ad3e/54602194784.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2mlajekj364dnc7mfce3of7642/foxemop.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65063101cb---wegavudurojojogibu.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e64c6edc1aa---16323906603.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/dajuwepeb.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ba0531cae---65577654.pdfIn PDF document text
    • http://goldmustang.ru/files/files/dolaxorogaxujadugol.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/84328152132.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C68 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_01_sfnt_off000161e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000179f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179F6 18980 bytes
SHA-256: 9b7b6f1b039998ae0ea67f017cdbf840daecdf0fbb0ccdff4ef4eb4b188cc48d
font_03_sfnt_off0001aa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA4E 10392 bytes
SHA-256: ccf0af26a83cf6d41672c5ac2d4e1624c9c119de8b8cfa3de21a5345296bbdd7

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