Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa7e94cb42df715…

MALICIOUS

PDF

70.1 KB Created: 2021-09-27 07:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28ab218a8f5bd5356b61cd7ef0ddcc5d SHA-1: 6db4da351ac2cc489f750196983d54520849bd83 SHA-256: 7fa7e94cb42df7157b856a4d74e19ead523156fc84870cabc52d9026f88d6aa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=metal+slug+x+apk+free+download+for+android PDF link annotation
    • https://sme.bankai.lv/ckfinder/userfiles/files/37637628846.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/37249852704.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/paruzupufis.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/tabosotivosogakik.pdfIn PDF document text
    • http://congtyvima.com/images/Download/75324190830.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/javepejevamojos.pdfIn PDF document text
    • https://0900107678.com/upload/file/33854821511.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/9cbbf0khprvedm6llu76f03vp2/lavepilip.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19536863197.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/63895331645.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/xavimuj.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/84980630079.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/nizukigasezo.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/67307551236.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16148b50162555---latovemomapugetusizulov.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/gefibiti.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/buzibonawijawexozebu.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d7c7713c9a71b65fc009c537e8928271/kuzorumabofaverusoxupites.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/gdeuv5qto2qu4stnm7gaq3u180/fomupazojojekinimivutog.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/04f8aaf731a9c8bce0a2a128e9e77af7/48143971867.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/94997845372.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/pafetaxamul.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/49948600022.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0185c3faf---7032380761.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_off0000b2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E9 14316 bytes
SHA-256: 6e98e62906cf43be3d61590a5f522b06d4aae0685427ba61bb54fe3969765869
font_01_sfnt_off0000d69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69B 11048 bytes
SHA-256: f4f78cda431cbf4b1bdfc816cb3f2d215da87e110e9796904cfeed2b8ba478f1
font_02_sfnt_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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