Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc83d03aa02076f…

MALICIOUS

PDF

76.0 KB Created: 2021-09-29 01:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0e6d5ca2accddd8a99ea5eac9e44d892 SHA-1: b07ce198270fbc34c1601e955fa3d20d19dad1c1 SHA-256: bfc83d03aa02076f6f6f317457fd65262e29699f17bfd97403674c7d111fcf32
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to user-uploaded content directories on various domains, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 http://obasekiestates.com/UserFiles/file/luzuvevisexuramu.pdf In PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/16813941550.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/7132882311.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/83722999414.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd5368bd7d---vatibajejibatek.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/tuwufeba.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/96117002499.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/28454995064.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/70694349051.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/d94eeh21hrorpho166js2qmr44/fudewimepoxufonetalumifeb.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/12887285715.pdfIn PDF document text
    • http://17njl.com/userfiles/files/ropupirevugiwodafan.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/verotewugewinevavep.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/94739968343.pdfIn PDF document text
    • https://renetravel.ro/images/files/jumada.pdfIn PDF document text
    • http://pmke.cz/pictures/files/30164550146.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/nofegipuvutomatomaximude.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/51426920736.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/zawozevimupivabazuxore.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba0e24e41---92018755599.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/nofomevujagerudixefalot.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/gilabek.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/wuviroro.pdfIn PDF document text
    • https://oasis-travel.ro/files/64458879762.pdfIn PDF document text
    • http://rc-modeller.se/images/file///simuxodurobokitavu.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/kinutuxedifoluleza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=office+365+activation+code+cmdPDF 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_off0000bc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD419 19764 bytes
SHA-256: a9add6869d0453ff42f49ea38f70b38f929bd018e25aef00d99e7639e4dd3442
font_02_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 10888 bytes
SHA-256: 51c8d0b472c4ad6799715d80fac788f54dd45590c3a55974dea1bab71bc07b0c

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