Malicious PDF — malware analysis report

Static analysis result for SHA-256 67acc30efdcb2b51…

MALICIOUS

PDF

78.3 KB Created: 2021-09-02 08:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75e7dbf3ef9d96dd9d50bdfd7986f397 SHA-1: 4a942a2a5a9a70ce08d9137cb0eed3780c457727 SHA-256: 67acc30efdcb2b51aed2fa82ce8fc1c955d851f11f15c2dd47409d9d773020a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to external resources, many of which are hosted on compromised WordPress sites. While no scripts were explicitly extracted, the nature of the PDF and the presence of external links suggest it is intended to lure users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec2576f565---76528289474.pdf
    • https://promenade-perpignan.com/userfiles/file/63625452683.pdf
    • https://audit-advisers.com/userfiles/file/40996366733.pdf
    • http://red-persimmons.com/upfiles/editor/files/vuxari.pdf
    • http://emailreceptionist.net/userfiles/file/nugebokeputa.pdf
    • http://agrion.org/upload/fichier/75068872063.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/fa14e9c4fb93b573e2ea70c705cd9c62/jemovajifetirotuledejow.pdf
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/89478048397.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/inu86s52cn5ofqo2625ke3j7l3/borutipugavus.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b3da2d95---22670523583.pdf
    • http://www.pvvc.cz/files/53150797661.pdf
    • http://lltsg.com/uploadfile/file///2021060708172576.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf18343cd7---banijodolek.pdf
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/venoxozasiligukodakixap.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/47003893fbe1497d23873a47e73855b9/fulujilum.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7a1f4202ca4a81b79c8703a2a2624812/widufis.pdf
    • https://melz-feu.ru/upload/dixinu.pdf
    • http://gtlitalia.com/userfiles/files/vezonupokub.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608253d90f6bf---fedifezuwejofel.pdf
    • http://atthaya.com/file_media/file_image/file/56139614264.pdf
    • https://dagvandearchitectuur.be/_files/file/sogimog.pdf
    • http://xsteelstock.com/d/files/lofov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=flp+frt+and+cre+lox+recombination
    • 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_off0000cc2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2A 16792 bytes
font_01_sfnt_off0000e43c.bin
946db70e5754919c1600ce0235daaa8f2482653bc1a6ac9f0936dbbde02b6afb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 17608 bytes
font_02_sfnt_off00011202.bin
00878cfae57a8cde1638832288fc6fc14274daedfb5d30787b3c87243d7e32ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x11202 10832 bytes