Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1cf056b80ff839…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 06:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 213b7db8a3a4a03eee4fd17a804baf7f SHA-1: eeb023b19d931c88aafad805510f465063a246ac SHA-256: 4e1cf056b80ff8394f08f0dca934e340d36367de044a634a05a3233b0ec2ac44
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and potentially malicious IP addresses. The embedded URLs suggest an attempt to lure users to external sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://garglob.ru/uplcv?utm_term=factor+analysis+example+spss+pdf PDF link annotation
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1276cf9d---ketunijatedovepur.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2a3404cf3---ganukafevutosokenuv.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/zogona.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/79924496338.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/36474525688.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/mopafogekogesilezubomo.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/sj23jiiovf32qe0h5aibnoj6fmm042o1/wuwug.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9953c77d07896c226332df4f52ab20b4/fadikuk.pdfIn PDF document text
    • http://sushibelovo.ru/files/48287878898.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e6833c4caee5c2059fdecb09b8ba00dd/tanisajuwukokeberajasabu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0f9e75c9---62728690704.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/71113314506.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210530220906.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/77214887882.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/48698317410.pdfIn PDF document text
    • https://cityface.cz/res/file/6929981704.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607526463162d---xuwitejovapowumawixowaga.pdfPDF link annotation
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f93ea078587---15430010991.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/46030955760.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/bea1c7ef18ddeac9f1f5d2289bcfa0d3/lakewepezuvedofelub.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/33013140452.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/58664942157.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/59750095039.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/17789407087.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d212c88668---67389975988.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_off0000d06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06E 10972 bytes
SHA-256: a2291869b4824b3b431d20479e1473f4378b69b5c1fac5dd828b8a33d65399f7
font_01_sfnt_off0000e9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 17984 bytes
SHA-256: 5e68adfe7f27216d027485051b568398a9f9683fdec480fe3926c553c943c650
font_02_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1