Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2be78602d081e0…

MALICIOUS

PDF

83.2 KB Created: 2021-08-25 02:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ba33914a31d6fd5ecec355748045b9de SHA-1: 5e11f8fb140419c81deca65d6539fdc7bbcfcf44 SHA-256: fa2be78602d081e01eb7cdac97fcfa90cfddd7c477bcd14e453dae9e0edb9673
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ieiueq434209m357m9apelrjr5/47237727806.pdf In PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/d9ba921c90528fa8f44171b0f194b9b0/3588082105.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/72979955307.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893e3f111a7---8411055103.pdfIn PDF document text
    • http://netflor.pl/upload/File/kexete.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/68614093671.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/13399720742.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/2253220776.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/wabikavununivuvogojorutig.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/rufagagisotowajasejisob.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/733e81f1a38375773029075d47e9f92d/mafurepafevezabesowopew.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/3be36123f169d7c4031b558dab0d4326/bigatawexok.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/94450273323.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/fba47287b5b389b1973244c1b1a39734/lulululeborufabamune.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/01be6c257f80ec4147ea4538eed36075/36278644603.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/xuxikilupabijaruv.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/sunakafebedazebapow.pdfIn PDF document text
    • http://camonetinternational.com/files/file/zavalivotuzofaxu.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95c9d3f80f---31308607835.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a06078e68---78661435126.pdfPDF link annotation
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f8eced4f07ffad1e49c384b70ed1ceb5/33626139142.pdfIn PDF document text
    • https://fishboat.hr/files/11818172904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=lesson+plan+for+maths+class+4+pdf+in+englishPDF link annotation
    • 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_off0000dff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF0 11104 bytes
SHA-256: a18643d2340ee35c72b1254de7c42ee8008260e43ea6f1577af862f9682b8856
font_01_sfnt_off0000f97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001118f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118F 16644 bytes
SHA-256: a95d6e4e088fbd4ef0a3b068c84cabececf9bace64db840ab6e4b453dadab73d

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