Malicious PDF — malware analysis report

Static analysis result for SHA-256 8728973f15b2fda9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 16:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0af6637b50221a664fd89a1eb4851ae4 SHA-1: 2ecad1f5f6bf3bbc402a4083bd64902aca8191a1 SHA-256: 8728973f15b2fda930cd59adbdbeebb8bce4ebf2e2fce82edf5b2fc7f1d04a32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7gp94mmbq3u5lvegmi0omb81ep/62885749895.pdf In PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ddbb2812d---topuni.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/2136039399.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a42a7d7883a---91744208494.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20574833050.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b57f7eb7ed6---60750615299.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/wazusefadolukakabixado.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/rutem.pdfIn PDF document text
    • http://fedoro.ru/upload/file/togulupawatovokajinakaxa.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/vvk2h2qcfiavnnrso8kqdojjd7/zulidifewinuxodokigava.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf580bc507---towujatosejejaxubidilev.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/gudan.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/80061559492.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf799e66cf---semuvadazifem.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/44467047506.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de377c2ec3---51544560720.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/72389437524.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/996201cd1fedecee67feaad2af4f49e3/goxidurixoxovunefu.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/04603d89d4168cab828f6c267a826e50/421479071.pdfIn PDF document text
    • http://bjallstar.com/upload/file/zepukimutipageforurame.pdfIn PDF document text
    • http://bakoca.hu/files/file/75301105273.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1712b2ac094c768bed0cbce7f6d78151/jowadepijenubirepisefop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=chicane+the+sum+of+its+partsPDF 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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 18564 bytes
SHA-256: 2a4a080d16ebc1eeb6d866483f359ebd1c442fbfafd3f8ff07cb13e9daccf749
font_01_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E8 10828 bytes
SHA-256: 4d5b48f0483d9c2f58b4204e929779f7e4c929f8517edd853832bfbe33a52072

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