Malicious PDF — malware analysis report

Static analysis result for SHA-256 378f94fc7817d884…

MALICIOUS

PDF

74.9 KB Created: 2021-09-20 13:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a9d1d94ed53027ea87917929f20f5dba SHA-1: 4a66524b7d8aed30f5c1097dadb37268cd275afc SHA-256: 378f94fc7817d8846baef7c4106eef0f018b8227406da4c657c3295c4b9d0fde
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm suggests an attempt to direct users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=how+can+i+know+my+phone+password PDF link annotation
    • http://lpsa.cz/userfiles/file/jufabiged.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132af9b04d84---nizabe.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/67563906500.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210909_CFA6CCCEFB3BD204.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fugonaxenomebudamaket.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/24437204156.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/16190526057.pdfIn PDF document text
    • http://penetrat.ru/files/files/54837052042.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/gasez.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210916_FC569D6A49C4050B.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/79360745807.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/witej.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/57106441095.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/68543190171.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/jexabixarukir.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210906165247.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/59745337828.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/julive.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/rqiacvd5s9c7c0ij70ulpqju72/setumedi.pdfIn PDF document text
    • http://tradotel-riviera.com/file/68845266016.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/eb923359f5efbcb32fb36902ba207b4d/jivovab.pdfIn PDF document text
    • http://etre-belle.su/images/file/73847429307.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/36500509408.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-6/20210906162318867975.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_off0000bdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD616 10920 bytes
SHA-256: 53dafa8194062bd8b26648390af46df02227dd21e99cb73ccc7428711adc4560
font_02_sfnt_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 18416 bytes
SHA-256: f683c3319b3eff74f388117dbd86c39775daa2b3fe02ea10cacc4e1eaf44d077