Malicious PDF — malware analysis report

Static analysis result for SHA-256 f60c9924866a52b6…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 13:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b39e7a214497d573610c3ba58f3bb99 SHA-1: 5eefa8998e7c819c151983348adf7f571f37ef3a SHA-256: f60c9924866a52b6c8ab90873ff0f556a646a2baa8bd3755597a3b2629d3349d
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. The presence of a 'download button' heuristic and numerous links to compromised CMS uploads and disposable hosting suggests a lure to download further malicious content. The ML classifier output of 0.983956 strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=top+eleven+manager+mod+apk PDF link annotation
    • https://taksis.lv/taksis/userfiles/file/tekijejelazezuluxoresu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cabe283d00---76860799770.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/85453577392.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/nuvomujaxiw.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/borexutugefozozosu.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/tanumogizedukitoxafo.pdfIn PDF document text
    • http://lg-palette.com/upload/files/voxalawanu.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/48142720974.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2b0e78b89---sajevamumemalekavofob.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/830507492.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613532e9eba8a---wezanufigum.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/vuzududa.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/buwomimagodutuwasebebiru.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/25681640614.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/suvata.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/44512215613.pdfIn PDF document text
    • http://labonscafe.com/userfiles/99928979947.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/xibovirej.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/28144245878.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/22997446865.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/bikeponujezoxibudega.pdfIn PDF document text
    • https://nyig.com/files/file/20176793766.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/67104137154.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/solilonawuvoke.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/69679520701.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/50497632373.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_off0000c758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC758 10496 bytes
SHA-256: 4b0ce32fbfcda886c5789a40a4540382752b0ea3f1e37a44f44bfb8fd68f079c
font_01_sfnt_off0000def5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF5 17520 bytes
SHA-256: 082c0d9bbebfc9205cd46b7ab400cc298d79f7ea72573134022291b1c8e9f660
font_02_sfnt_off00010c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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