Malicious PDF — malware analysis report

Static analysis result for SHA-256 1936bf3bf35b39ab…

MALICIOUS

PDF

123.1 KB Created: 2021-08-14 14:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07e329e12481a1cedbe703f44311bfb4 SHA-1: bc8456803491d1bd40eee04f69e1e069e177816d SHA-256: 1936bf3bf35b39abe8bd80170852a6ae0586afbc8bece3e048758b24df163600
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, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.valathors.com/ckfinder/userfiles/files/fibuxupib.pdf In PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/52897195361.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/39b7a18ba9290a6f3c1f5165a94c86b1/75739253871.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da64e7850bb---39154356373.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc40ee668---lonavimupakava.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/xavufalidapem.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105270300546157.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/80b0afa29e584d3066c106921d6468bd/bajeferel.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/puxogazowezutarinitugud.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/pozepemuboxidegeke.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/60690579644.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801bcf9593a---4635390460.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/0244b0faa9fa4eec7920bee15c540cb5/kufat.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/ziwaxeni.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/evci69mpe9rjunorkbqrg8c94j/57624434849.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5daa4d335d1798e0066b7f47121d8ac6/joniz.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/ninipov.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f392b7b8550---xisusibedubena.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ad497aee3cb---pekusaxibalazubid.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/44546308822.pdfIn PDF document text
    • https://emmaushuis.org/pages/48792341821.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/95074005486.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/zajiduluzabun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+mp3+ayat+kursi+beserta+artinyaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014a1a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14A1A 27828 bytes
SHA-256: 529a1e2f2e0bbeb3e7bb6d4314b487a6efb8de299039b7b6c15fd90a1830fe5b
font_01_sfnt_off00017c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C35 11256 bytes
SHA-256: 11a544f46763482919b27ea7a78fb7981540b05c9294509cce4620573dc5ce0d
font_02_sfnt_off00019674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19674 18276 bytes
SHA-256: 46ac155dee40b941c88bbc97ef1679b9a55d45a3ae605bbd6d968c6c33cb4f30
font_03_sfnt_off0001c5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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