Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1772b5d8e31b54e…

MALICIOUS

PDF

89.8 KB Created: 2021-07-04 01:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c4c6ef592552b760504dc8fe534a86c SHA-1: 3135a221cc46997674067212d9d8a4c975ecce2c SHA-256: b1772b5d8e31b54ecf7499fb5ced00a1e8497b5e94ba1d213a757e11db2c6c1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to compromised websites, which are likely used to host malicious content or redirect users to phishing pages. The presence of multiple links on disposable hosting and compromised CMS upload storage further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://aucordechasse.fr/vosImages/9276129544.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c413c6690e---zazafavogizal.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa784b167f---wegibuxevonoxofegubulot.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f8890c85f403af1970e3b89ab3ffb20d/43002352060.pdf
    • https://hurtowniaroza.pl/upload/files/19850264326.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0e9db96245af40818a512e9cc3c65886/92580132081.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a84b2fd5e65---vutotovapuwope.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608407480ad49---razexaxumalisodi.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f7010465982c5f58938e298b8e466f7f/zesigakavamejojozij.pdf
    • http://rolmech-strzelno.pl/Upload/file/38687387512.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd781efccc---bigilelopokif.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/doufhca8hqk57qal3jrtqgii4a/80695784091.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/3052048566.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d58e37194a---nunuxoxilojizobeg.pdf
    • http://curry-box-deluxe.de/userfiles/file/sadusuleko.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jonalovasulutolaruwik.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/790cb956b40555035b5a0992d68cd397/gazito.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2c829a8c2715ac5622f649389f98512c/78609669518.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/7b6883911685f2d89f84ef515ad0e724/bexotabikajubi.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ta2od6l5a1ooh5di8onkrcc2d7/fijelawapevaxed.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/2171be99f158f54e6ebd85fccdabf6e1/samerilatelarez.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=illustrator+object+perspective
    • 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_off0000f971.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 16792 bytes
font_01_sfnt_off00011183.bin
4dbfd65110081cc0c9011caff31f019f60d9f5a8f32ace1aedd257be0b671a65
pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 18088 bytes
font_02_sfnt_off00014199.bin
31cae210402418b726e1c242facb6d2831719780ee2612c8b66f014e8c7af286
pdf-font-stream PDF embedded font (sfnt) at offset 0x14199 10648 bytes