Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f87512a481112a7…

MALICIOUS

PDF

84.6 KB Created: 2021-08-09 03:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 227dc61ae7f5ad6cd220117cd4f0f74a SHA-1: 87729b9ba048527937119828d6d80577dc06d9fe SHA-256: 1f87512a481112a7010e1bc310c6b97f70a6db3062d51881cc075b01739e01f1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to potentially harmful content. The presence of these links and the detection by security tools strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/5054708dd607d1cc61d9e7e3045b6bd6/puzasexofejugolirej.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/6kcrcfl8dao83v1nm0thlq2dh0/telesokobevimur.pdf
    • http://ueros.fr/admin/ckfinder/userfiles/files/45578879455.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/s8060c93gaok4pakvqehb488lq/58742115799.pdf
    • http://cpgny.com/userfiles/files/paripopaxi.pdf
    • http://duszek-lasu.pl/userfiles/file/19623982807.pdf
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/kijiwebeloxes.pdf
    • https://aawyx.com/sites/default/imageuser/file/96455088361.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/dbce5b5738c4150f82160bc26a9ed572/54274208378.pdf
    • http://hoadon-dientu.net/images/files/63078591209.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f78261dc64a86b4b3da78e0067e5d38e/xobegubixa.pdf
    • http://krukewittfarms.com/userfiles/file/85356315602.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/11669419750.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ls1pdu94curb5hfc1cujl6linb/90639829215.pdf
    • http://pattarasawat.com/ckfinder/userfiles/files/bulisanowawatapoxo.pdf
    • http://insfilings.com/skyzone_classic/upload/files/42802011098.pdf
    • http://autothudo.vn/upload/fck/file/ridebudidubara.pdf
    • https://cargobull.cz/res/file/vubupesiligebuwemumof.pdf
    • http://computergramm.com/userfiles/file/56448042615.pdf
    • https://loyd.rs/images/file/54524162508.pdf
    • http://alwaysshine.com/fileimage/file/81956373634.pdf
    • https://marljivo.hr/UserFiles/files/xavugosekesifugamuriba.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160bc836d58a51---81513185295.pdf
    • http://hyosangjo.com/userfiles/file/20210705052245.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+pair+arteck+keyboard+to+iphone
    • 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_off0000e6d6.bin
dbb7245fb6037d8337976ce715e65ad2d6522ed19df1275c98c654feb9f56928
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 16748 bytes
font_01_sfnt_off00011240.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 16792 bytes
font_02_sfnt_off00012a57.bin
5b4da0486741471fc56bcf96dac2d813136d21989fae3862d69572c108877a9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A57 10820 bytes