Malicious PDF — malware analysis report

Static analysis result for SHA-256 5446e947fb95042d…

MALICIOUS

PDF

86.4 KB Created: 2021-06-28 04:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e5d31f319ede01f133050cdcbf792f8 SHA-1: 7c55abb515f620553e168f04a820530f9ba7d3e1 SHA-256: 5446e947fb95042d78eaab0095ed71e1fc5e7d4dfca953636962b31466ec1a70
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating a lure for recovery secrets or private keys. Multiple URLs point to potentially compromised WordPress sites hosting PDF files, suggesting a phishing or credential harvesting campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to trick users into divulging sensitive information, likely as part of a broader phishing operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606c786f7cf06---xiwidobemeza.pdf
    • http://asja-doll.ru/userfiles/file/bitebufurobelo.pdf
    • http://work4shop.cz/userfiles/file/gigibowakiw.pdf
    • http://clubmaniacr.com/campannas/file/redopovatazutigofafomojo.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210601_96B73CCA0AE125CD.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099ff0ad113c---darojupupegew.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7edd3c011---vasojubilimabobagu.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/0qg4fs8uuj7nbr54bpbo6uf7ot/luser.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/3qv682dcfuoapppjo55umo1ds2/lakonalorugibonog.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16072a939ad851---gukoligufupoduwuranazaze.pdf
    • https://codecs.ro/images/file/rozibax.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e259113394---56869445367.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735a0a3613c---josutisokatotuliza.pdf
    • http://mikailang.net/userfiles/file/20210624125156_363477135.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/h6qau2pe4bj229gfk8u8uki1tq/6473979731.pdf
    • http://kapsalonindex.nl/images/uploads/wakin.pdf
    • http://www.zywawiara.pl/pliki/mafivigevigenoza.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfb1179b19---30427691042.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/0b2c793ced266596bcee6e48ac32e6ba/rilegutixofodim.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072835c6aab6---19893140359.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/7c9359ef8bc797657d0800b6cb1ab1a2/buzaleniwajoser.pdf
    • https://cottonweb.net/userfiles/file/dekugopolibajewele.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/6222a56bb5677a8ecdb154c0ada4d182/towuwodekirovowiwi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dr+mcgift+px
    • 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_off0000f19e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 16792 bytes
font_01_sfnt_off000109b5.bin
3d54735705cda148030f08a340eff4fc7af5ecb48c1c52929ca26e0269c122f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 10196 bytes
font_02_sfnt_off0001208f.bin
f86bdfd67293224902cd9814402c7ef9f0a33287d2f52d5a31678dca0ec77890
pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 17156 bytes