Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c4b63146c609ef…

MALICIOUS

PDF

85.9 KB Created: 2021-06-25 17:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9d3840fa2faa28770bb3d91acbaa9b7f SHA-1: 4e14811b7567570eebb53799969151e79b3faa2b SHA-256: 41c4b63146c609ef3b2b11a73d20299bf0196910fc9d20be53e87493b92a06fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous external links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple PDF-specific heuristics related to URI and link farms strongly supports the phishing and malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=a+group+of+elements+that+has+two+electrons+in+its+outer+energy+level+is+the PDF link annotation
    • http://amblesidewindermere.ca/fckuploads/images/file/kunavetevubuzawuxux.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/18557186572.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210507084157.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6ad1650d3---53799956930.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd6170808b---3117188882.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/xumasolowokuzudojevuxifu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a229462cad9---lozugunebewegovejusibitar.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/86510017422.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/8436e66d23140e6260fb34094f39fe2a/xuseluzavilazexo.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/52991600744.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/3761142050.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb471d4a41---bewukewunezejevawezerap.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/38097033580.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/9qaqlj6q3jkbgn5iand03ncd66/maxemi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608df9a902fe2---66093607571.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/morifazuvub.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/qj93dr27gd9orqrvis70pva682/70217460819.pdfIn PDF document text
    • http://aplus.to/userfiles/file/vapimugepexekumez.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/28643868096.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091f0c7c9e0b---gotowizaguriforoti.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/romogagugavax.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/83357159088.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/saruvipimulidifet.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb8137fe4---jadixugejev.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c27953ea0---65348022029.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_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 16560 bytes
SHA-256: 25d04984240268bc648001f6208c699d451b8f0f742945f6d27d6956acd12e34
font_01_sfnt_off000116f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 11276 bytes
SHA-256: da5380f3b634974265390fb21d816c3dca226f276d5430308093382195ce5172
font_02_sfnt_off00013155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.