Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bdb6310d1aa7db4…

MALICIOUS

PDF

87.9 KB Created: 2021-08-18 13:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5333bfe11e904bc027af55b01826d90 SHA-1: 8d4c074fdeb930fd6abcbdb1d75ea00715a3ea6c SHA-256: 1bdb6310d1aa7db4305166202b1f82ae3443ba0cc6f9d3cc2f3cc5969bf3c317
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://retta-bg.com/userfiles/80306834524.pdf
    • http://phdpecs.hu/userfiles/files/lijawuxijativipewupitite.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ffc067aba1635c6289ea8c2b27ee1a9c/21659528327.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c066f2cb4e---xareda.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608d995d92d10---dinumexejifejaxojagawoxog.pdf
    • http://mprime.net/ckfinder/userfiles/files/linewajogigomegeramegowu.pdf
    • https://ikima.fr/uploads/file/vabitemenimilomab.pdf
    • https://hoavily.com/uploads/files/rotosudopa.pdf
    • http://dioceseofniranam.org/userfiles/file/zivemikobilar.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/351980241.pdf
    • http://studiomuraca.eu/userfiles/files/7242838539.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d064dbc29---74630935762.pdf
    • http://bacsiha.com/public/ckfinder/userfiles/files/xudurikemegipivexemurivoz.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a20d2997f88---givunimer.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098a7dfd7091---kovisuvunavozisomadajuw.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e280ebdb---94014274923.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa91d5d561---93576212754.pdf
    • http://akkoryazilim.com/userfiles/file/67981510401.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607018e933637---27464865629.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/2289cbf9f5de6955409e250d99a4351f/gaxutuwedivude.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e03a0a82077---wajafegimogosizadoditu.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/38a3e3ae5805e48b203a86da648d8429/podemigivuroledud.pdf
    • http://juha.be/_files/file/75586201821.pdf
    • http://wccflooring.com/userfiles/files/3660611038.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c513aad41---50705325564.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=comptia+cloud+essentials+study+guide+exam+clo-002+2nd+edition
    • 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_off0000efe0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 16792 bytes
font_01_sfnt_off000107f2.bin
95a31882679b6c9fa20d61f394466a3b12ebdf483b68b973787a98538be73495
pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 17384 bytes
font_02_sfnt_off00013599.bin
8bbd0e95e45cee123451b5ec0a886ef5d35c1007c8e787a539f94e095b4c809b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13599 11380 bytes