Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bc869055409ac1…

MALICIOUS

PDF

92.7 KB Created: 2021-07-06 15:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c774de9cc32133420354c8248921dc14 SHA-1: 38cc3b4de9fcc8e6e05f8bac77c52fc43078d47c SHA-256: 11bc869055409ac1d6730286c5d14b1e895d1ccefd3b1c5264b963d4f76d7d49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=gelfand+fomin+calculus+of+variations
    • http://www.anieliasfx.com/uploads/textareas/file/86533416500.pdf
    • https://mimpishio1bet.net/contents//files/73443314369.pdf
    • http://pantryscan.com/123cars/imagefck/file/xupavanilogixesiropotomof.pdf
    • https://bgmediation-flm.com/userfiles/file/45508897529.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c318e98efae---bunitategezofodukozo.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a8fa4a98f---75030238356.pdf
    • http://baugeraeteverleih.de/benutzerdateien/15215574215.pdf
    • http://bannermaul.com/userData/board/file/25550298446.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608163d296d15---47398445914.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1c589a4a6d71dc93943342ce8c243c29/pezivukuwe.pdf
    • https://myphambambi.com/webroot/img/files/65323763153.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a79980a9c6b---45054810621.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/u957u1jubocl97pk1s6chvqpv4/41457715826.pdf
    • https://ludifrance.fr/userfiles/file/tugutuzesenudebuwu.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160934ae8c45ed---wakabolaliwinafox.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/545d1e39962cb41c2fa3568bd90acc7a/86695249553.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b39815ea93---jewixoji.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/81a6vdjbecj22p5s211mm83m2u/74278506114.pdf
    • http://e-hematologica.pl/users//file/88210066757.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2c7968fa---80223220489.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ojk09g715gsv7rbfcitq4pue65/81585793457.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c504ec67---38205832134.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_off00010081.bin
8f24400f5912d3c50016de1c1b3a7c110dfe3df38b80fac36c467c9b0c5f2817
pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 10844 bytes
font_01_sfnt_off0001198a.bin
3dcdf33ef7deb6c4f209404fa6f8b85e403d94daddd3cb52bd7e9314962cea8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1198A 19576 bytes
font_02_sfnt_off00014d7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7B 16792 bytes