Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd93ff9b16033cb…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 11:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 784b23ca1bacde7614f935532727f037 SHA-1: 5fb9097dfe057abdb3457e1be241731ffe0996e7 SHA-256: fdd93ff9b16033cb61939c8f22b24ca81ee4bd9d3ddfe64303dd8eef71ab37bb
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The PDF structure itself appears to be a lure, likely intended to trick users into clicking through to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://allora-tour.by/var/upload/file/23485778924.pdf In PDF document text
    • http://zzquansu.cn/d/files/watelagifi.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/jenewujas.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/rowamo.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/99e62af04d999b6fd7cbf603e18ee406/70560297386.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/89061699904.pdfIn PDF document text
    • https://isleo.com/i_photos/file/winisifaw.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/jegonutitenefiwipag.pdfIn PDF document text
    • https://value.ae/userfiles/file/gulejufeligex.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/80780179331.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/gifutujuzemududumas.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c975e6b3bf---saripajogedewaladotebil.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/13388424583.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/fafizogedelisoninalum.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/vapogusafesopujumisit.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/55243388810.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/60118620343.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/78802646529.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210903_58D8DA55ED011EC8.pdfIn PDF document text
    • https://aksusu.com/upload/files/25501330863.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/22818729741.pdfIn PDF document text
    • http://jaatkinson.com/userimages/26814351947.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/nexerawawemefesajud.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/sowog.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338e4488040---juxam.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/kifebunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pubg+official+apkPDF 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_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 18384 bytes
SHA-256: a771b00ac6c2e490c1402a8a1409e4d9483339e429d712bcd02048004e276975
font_02_sfnt_off00012c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C41 10388 bytes
SHA-256: a24a2c0608b30584764aa613fc79ed4fb2a8eaece3f75812226658fce7e53517