Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1aa7b1ca3cb58da…

MALICIOUS

PDF

72.4 KB Created: 2021-09-20 15:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad17b0342785650c94cf36c94ae9f236 SHA-1: 4ed10a07e6dedc608c6b23f095755eb2bdc35298 SHA-256: e1aa7b1ca3cb58dacf93c8e7846f58643415f6f1d7cee11f5d2b0a4d036f1bf9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic indicates a potential callback phishing or tech-support scam pattern. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent. While no scripts were directly extracted, the PDF structure and heuristics strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://laborke.ru/uplcv?utm_term=what+is+sax+parser+in+android
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8c4e5faf80a16e2887bf45c5169f5e65/91977689789.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/54d88bmj8p89pmvs322jn26ihr/46136800423.pdf
    • http://ceresasrl.it/userfiles/files/talovik.pdf
    • https://datajournonepal.org/files/sanositubasogogoseduzas.pdf
    • http://wmc21.com/ckupload/files/39139569193.pdf
    • http://nguoiquangphianam.com/uploads/files/6038945972.pdf
    • http://japan-railpass.info/images/blog/file/pagogenogonatoxumadokaxi.pdf
    • http://esenkardeslerinsaat.com/resimlerfiles/40148630708.pdf
    • http://888chji.com/userfiles/files/getup.pdf
    • http://ovecollection.com/royal/admin/images/products/file/dagotexagevepom.pdf
    • https://motelandratecuci.ro/userfiles/file/xisiwezotijane.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2a0bfil73jk5q9fsss9ptde392/pejuviwatufosomi.pdf
    • https://museuminiaturesbesalu.com/files/55828449411.pdf
    • http://140.121.125.49/ckfinder/userfiles/files/20210901_144728.pdf
    • http://nage-z.com/ckfinder/userfiles/files/vapupipexotowuwumoli.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/99936746618.pdf
    • http://blpest.com/UserFiles/file/jopisosubogefikivabomar.pdf
    • https://bcm.es/files/galeria/files/73777418987.pdf
    • https://confeccionesruiz.cl/UserFiles/File/97243949144.pdf
    • http://gtlmarinefuel.com/userfiles/file/lixanusulefopipa.pdf
    • http://pensjonatagat.pl/userfiles/file/39498989397.pdf
    • http://stark-tools.ru/images/uploaded/1820471292.pdf
    • https://rtquery.reitoken.org/Coaching123/images/files/wazorapunuronu.pdf
    • https://www.naabelectric.com/userfiles/files/ruweworivofitetoluma.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AE 16792 bytes
font_01_sfnt_off0000cfc0.bin
61931909dc9096da16fb7a6b053c74754c30a54725d07b9410b2bf59a89a539f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC0 17288 bytes
font_02_sfnt_off0000fc45.bin
f0fffc0ffd5ec0324329bcc86c19d6b3afd53a427c0bb9bed27a6db91bdd22f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 10536 bytes