Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e771e292451776…

MALICIOUS

PDF

70.7 KB Created: 2021-04-29 21:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aca445ae994745d53e9e3f913f3b5a1c SHA-1: 9c1ea2dd2cabbd9feee251b223211958a75f6a34 SHA-256: 31e771e292451776d3d8025136a44a9596eff3ac44bf49f31a0ecfd2fc4aacdc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://curry-box-deluxe.de/userfiles/file/66715836449.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076b7aa38ccd---gupodugudojubugexewu.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/gk2vpbgu0gtc3bj7egv20kuavg/befalawadivema.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9da145c5593a6f1f5fb3525d4d37bc28/rigamafupumusitofupavix.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e14f1a1f1---23411513777.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/881e869d07f54955d47e321af5914839/gavudabifapi.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607f30d5288c1---23534811952.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/d66jd9ijauribdfh0j7mbcj691/64222709789.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086189c0ff1a---87417610976.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3421f678---gakipakupewosonagi.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ed8e3d92---sifebirifuvub.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/3usir0s6vqe1l36amthhcp3e0q/gimadorupamop.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/671b8ba360938ea3d10e1d0e10f6d0a2/76707840299.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/mrortp4ujaervig7ca9h1a1742/bevinozipopo.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/uuvf3l6ehc0hd09ro2qvud7p5l/mugopopomujurafoxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=inditex+group+annual+report+2018
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d861.bin
bbc9c9b9b728aff36b9d9a7747aa5e53a064cf1e4a85fba6559ad6f675bb43ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 5472 bytes
font_01_sfnt_off0000eb19.bin
26d95bdbb4fa192acf6a3ca58d8ff1649135166e07b6a518ca683ccaaa6fb4d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB19 10332 bytes