Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c161c3bffe4172…

MALICIOUS

PDF

93.5 KB Created: 2021-09-02 07:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef9a80bdd0c82fa028012004a5f7414c SHA-1: e5a3a0fcdb3954f321ac0be45882493f244e8222 SHA-256: c2c161c3bffe4172db6f3b6a7af9565191e1317d8735e81937a0c7c8df315063
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing to multiple URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, potentially leading to exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e9f91f7d96503bed897ce5d1bc061738/tadopijonitupe.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912031759cf---20166558075.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/lekiduvisanajodazotof.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/42397822532.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/s1j6sga9smat64gi9hdvg54o40/41772428372.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/71932135450.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/kisawar.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/95830643437.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0885fcee56---nafabufog.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/72468225466.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/kerorugijejuvubexob.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/92058721756.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/2f7125b2eaf0efed50efd05aeb724760/paliwo.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/legabomisod.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/96542161286.pdfIn PDF document text
    • http://beiks.info/public/file/napetiwexetenuxazowa.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/02ti3v688n9q37a7jvjuaao8le/mawagazakosatanek.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b07faae06ee6c7a6dfab1b3694b3700e/31363944468.pdfIn PDF document text
    • http://idroter.org/userfiles/files/bagapoker.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/19032389519.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/katesizogulepudotuzidi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2977244004---wipufezafemimatolu.pdfIn PDF document text
    • https://tonitomov.com/picture/file/soxewo.pdfIn PDF document text
    • https://akemi.ro/hirek/file/69756394797.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/tewakukamipa.pdfIn PDF document text
    • https://airbays.com/userfiles/file/tidofepafolinemez.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f14051f38c4---16114554105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=coimbatore+method+of+compostingPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 11192 bytes
SHA-256: 272f8d470b1e2a8743f4e981e63a24b42a5f02411b662e706092cb8eebf1f37e
font_01_sfnt_off00012073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12073 18448 bytes
SHA-256: 7e8704e845eb2f34d58a8a37d81225ecb359e7d2d4d94923bc281c064e8632c3
font_02_sfnt_off00014fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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