Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f19bec4852ecb5…

MALICIOUS

PDF

72.5 KB Created: 2021-09-18 05:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11db9432e563d3cabf457afda2c89091 SHA-1: d8ea07fa649177777c2f921a06413da0ae0df161 SHA-256: 58f19bec4852ecb5c50dfc45571d194632462b3c465bd7042b8a1d97cd2383da
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_URI heuristic indicate an attempt to redirect the user to malicious external content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=how+much+memory+does+android+10+use PDF link annotation
    • https://wietsevoermans.nl/ckfinder/userfiles/files/fuwutezojemiterubemogepo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e878a95e8---12313300634.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145097fa10d2---78009752403.pdfIn PDF document text
    • http://fxmeat.com/upload/file/f67751b5b875f2e4fc5548795ea91bc0.pdfIn PDF document text
    • http://baoveantam.info/upload/files/19687363406.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/93284265818.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/33573277102.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/32138104273.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/57414026116.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/dukisof.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161454668737b7---52137208309.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f93f19a3e---55732638123.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/68881407822.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/66365548512.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/57734135355.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/3142097621.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/wexinelegoxifewunofeki.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/63180140721.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/budigotuvip.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/57469410085.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/26072098108.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613af94c2f4e0---duzekebozo.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ovha87chddkll9k39dvigsf0h1/xivurizuxutusavatoxefefa.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_off0000b994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB994 10956 bytes
SHA-256: 87f173663c8df46e0401a2883b2877c08df83084cfa6431f1e32ef4c302b87cf
font_01_sfnt_off0000d2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 16108 bytes
SHA-256: b6a873f3e2daf199e7b168a724c646bc166cc5db9a913b374840cb165e99465c

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