Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cb5da08737bcf4…

MALICIOUS

PDF

86.6 KB Created: 2021-07-06 13:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba97b4bf2e7acd1048dfdd92b943a148 SHA-1: 8832ba307efa2565ef16904b363caba847964ba1 SHA-256: d5cb5da08737bcf4a951f668b6b97ab8d464d73210f6ad1387af8fa742b15132
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for SEO manipulation or to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/91017n6ah10tbe7o4n4afm8v22/50631236881.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/664d4b386fb94f227ce221af6bb57262/329750301.pdf
    • https://atphp.ch/userfiles/file/59668973448.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094877b57055---kuvixipikogiludojaripoga.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/71367671903.pdf
    • http://pcwenhua.com/uploadimg/file/1623434317200215270.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f503d4c02---kezakibemajen.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/qi2peenav1bssifgon7k785a94/55018238319.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/ganafanezalikurak.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b311baf6d82aa787f490b0fdf3843c25/10731396994.pdf
    • https://permargi.com/files/galeria/files/jogetikosabebuwa.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6qbn1pdkimca3tftoc39l5b430/13387140814.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/7p6nnfrcr18rkkupgamh6vr7un/sopudogavavogibesomivamis.pdf
    • https://firmacorretajeschile.cl/upload/file/vemaroxifod.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f10135455d---87568310907.pdf
    • https://bcm.es/files/galeria/files/sugofi.pdf
    • http://guchenes.com/d/files/puwuvafugejeraz.pdf
    • http://www.bandungmesin.com/file/32686799511.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609019e668b59---sudurojulejerig.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b12850b44a3---79661518575.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/27129140302.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a28b5ecf017---polal.pdf
    • http://samtekelektrik.com/files/45155213499.pdf
    • http://princeverma.in/uploads/files/wapazafesebupesiwugub.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+many+miles+is+in+800+meters
    • 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_off0000ed9f.bin
6095378ff347a6fc1e62bb201aaadafaae3e73aad3f27324ec1301b8d92351aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 10788 bytes
font_01_sfnt_off0001067c.bin
7ff2e9952ac7809d213b86555b9bd015fc9495751338c6585c35cd60123257b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 17832 bytes
font_02_sfnt_off00013515.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13515 16792 bytes