Malicious PDF — malware analysis report

Static analysis result for SHA-256 164a56cf418782d3…

MALICIOUS

PDF

181.3 KB Created: 2021-06-26 11:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 786c948deda98d5b7c572d02a06a27e5 SHA-1: 3487d085627672a0abbd8052fca7688b30126e43 SHA-256: 164a56cf418782d3a9d95d0a8825360ccb49026a10150566a95ffbb2bba7b4ac
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload locations and other disposable hosting sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be intended to trick users into downloading a password-protected archive, likely to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://philabc.ru/uplcv?utm_term=how+does+bacteria+reproduce
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c712df71ab5---rigudolajapililole.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ea82850be---72406222722.pdf
    • http://3qbuy.com/CKEdit/upload/files/49853741712.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/j1hqrpsdmll63dgoeu12fn19oc/palijakezitogupox.pdf
    • https://hzautomatisering.nl/userfiles/file/1255237060.pdf
    • http://gabortech.com/admin/file/wiferozejonegusidikasowox.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/5lgvcvkjf4nick2evkcm8sfvf0/47108356625.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608f851b74cb3---bifukerekapoleda.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/72370a493a53a8a7e0d16be63fa17975/pinikab.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/d5260ecd6e7a920e5a61d09e8c05c69b/76752069918.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2315e1948d---33494065294.pdf
    • http://luatsubienhoa.com/upload/ck/files/10650124878.pdf
    • https://kaptenhoki.info/contents//files/wesevi.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e4f7ca8d---ribodopatuvibemimomutel.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/bffc55d1282a3dfbae4a5cebd10e8a7f/48070019241.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9403c0fd03d689c1b7e8e4890d248878/wunozufexe.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60e37f017a---1913731113.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/80f2694ef5a50a68188f0963c7cd579a/xilifivivewepaxaziwuw.pdf
    • http://desagresbrts.com/clients/34568/File/refipafesa.pdf
    • http://pathtojanna.com/userfiles/files/94373368685.pdf
    • http://agiusfuneraldirectors.com/files/file/belulum.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_off00026122.bin
d10efaf0607a69bb6519bc70687976660bd183200b05a577b77ada51c12529e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x26122 10676 bytes
font_01_sfnt_off0002798e.bin
6d9f496ba9af6bf62e507e58d9797b483d275c7f7f05724358a8a556e8f7ccc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x2798E 21472 bytes
font_02_sfnt_off0002afce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2AFCE 16792 bytes