Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f9416026f1f8c8…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 05:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d8d29eb6c3533715882056cb45dddb1 SHA-1: ca29653033c00eaf10448e7f5a3bc213ac9fdce5 SHA-256: a7f9416026f1f8c81d07f1c3bc753fec27c83e67d5a1c8d06562ecb9d5b88965
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs and links to websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of URLs like 'https://chcial.ru/uplcv?utm_term=adobe+photoshop+cc+2015+crack+download+64+bit' indicates a potential lure for software cracks, often associated with malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=adobe+photoshop+cc+2015+crack+download+64+bit PDF link annotation
    • https://ptogel2.com/contents/files/xometuduwodakovosonewoto.pdfIn PDF document text
    • https://gulamanis.com/contents/files/56843199611.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/zunulopepibowol.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab8b3c743f---retog.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/24590406705.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e85e19e37f---83054109072.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/17643558623.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/ludipivenav.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/nemobaguxanezot.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae794168d7---38387090381.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/xutenonojekoladejegi.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613694f36f279---farepufegoj.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/renudunuvodubi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e79d39975d---domanevizuzefovuxo.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/zavofunozeditopij.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/wikafexekuxil.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161345f475b438---jenedikuw.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/segirofuduk.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/vidaboraxisoxixarixokipa.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/julof.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/suzebogagubifegobefaba.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/denanomo.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/89341081823.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135573b36cb1---sanisexo.pdfIn PDF document text
    • 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_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 11584 bytes
SHA-256: 1d001d453e1610a10b355d602ffff892e748f6075d9b637569f0427952cbc519
font_01_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 17628 bytes
SHA-256: b53a4732ff17370e996a1d104b2280554a1af20dc1bcb5afa9ede7853088c638
font_02_sfnt_off00012347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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