Malicious PDF — malware analysis report

Static analysis result for SHA-256 393daadf752bc0c2…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 21:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c92b38f9264837b888b58fe6ca8213e4 SHA-1: a9b28a11b017fce8e419666039434a93ea11bf0a SHA-256: 393daadf752bc0c2933de98f4181901363a9aa420748037a222c3b7782a76f2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination or leverage compromised infrastructure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=the+mountain+between+us+yify PDF link annotation
    • http://ck-kutnahora.cz/gais/image/file/16357999539.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f539e784ca---kufedem.pdfIn PDF document text
    • http://livestocktool.com/d/files/96572352140.pdfIn PDF document text
    • http://maihome.hu/admin1/file/babibope.pdfIn PDF document text
    • https://redac.ch/upload/kofarumumaduvojo.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/xejomitewimizapanopo.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/71898956121.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/35829589624.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161316a26c0e50---fobawutedamit.pdfIn PDF document text
    • http://flomojapan.com/upload/files/dujerotutafatobazo.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/numeleputubetudekubul.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/e5k1e60jo87bircfa1bh7ej560/14165446028.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/migerelefalozudefiripoxob.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8e2420630---14348034522.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/38417973951.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/vigejedorizafepaburefot.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/linosexonolowakuw.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/78283494980.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/kumagatoxekukuru.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/96275686281.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/76420001547.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/44700389646.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/wokolugasexixepudab.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40660952687.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/dosomoxajozujebedibo.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_off0000d48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48A 23868 bytes
SHA-256: ca88388300a4e5078a666ffd25afc93d0eaf80fd4d9a915bfe5d348cf1e2643d
font_01_sfnt_off00011109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12920 10736 bytes
SHA-256: 1147ee22cd4dbfd5de798daeeebc99092c756e3408e4717657c67543cac41922

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