Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb5bae0b50c6b8b…

MALICIOUS

PDF

83.7 KB Created: 2021-07-25 13:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0c3b0e057b69f97a78c268c5d4537d0 SHA-1: 1457d4e07a66953698375545c0a012b46c67ba67 SHA-256: bcb5bae0b50c6b8bdd528abab97b1a8bbc6b7556877db11fb8ea7adf581ba6cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to potentially compromised websites, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7daa549c39ce949115440483e1833ef0/31655762152.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085e49a8f266---pumuwepifurulifeloxav.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/t4l1ourgm5p7noruq74q2d0dj2/wezag.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ba2788974---19682445563.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/rrjs0viomls991t1jm8pr2cpvu/sunosubatulutesex.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/81c9370ab435707808ccf92a1af04907/kixixus.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/6j5aq6ik4kd9i53dtmq58krl52/jatuvosisasijujazu.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16077b84d5f3e7---sedonatuvuk.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c161d0209ab---98494023140.pdf
    • http://krzeptowski.pl/file/lomikelojavu.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8d8f08f23d74885fb18caafa422c930d/69413757933.pdf
    • https://egyptsuntours.com/userfiles/files/27115995829.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bf0e37208---zozekovelofuret.pdf
    • http://gerocuki.hu/user/file/zubagefosajelez.pdf
    • http://jandebruijn.com/uploadimages/files/51410706638.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609b75e32f205---21812543841.pdf
    • http://stolizstekla.ru/userfiles/file/pididoridodon.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b676e89379---senegetafawifibef.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/e394dugs9ot7l94ogkocca65rn/87995101234.pdf
    • http://babyindex.nl/images/uploads/11884568183.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d143da920---zezeluwemokofubituj.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7359031054---95321287270.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7be5d8ea04---1787946472.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160712e1f81f6d---vemakiwawodiwixafutasat.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd37f55b07---peded.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b83d3e51---loweloxeboniwezefovi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+change+batteries+in+emerson+thermostat
    • 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_off0000e784.bin
3a89d2eccd2beb4cf843fcb053efd0c0e2d1d53d2ab7786bde8e89a3cb1024fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 15784 bytes
font_01_sfnt_off0001100c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 16792 bytes
font_02_sfnt_off00012823.bin
471fbe75e36e299805a2d06bbb9a21a4ae8c3d5d66b7c44ad4cb3eaafab85623
pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 10848 bytes