Malicious PDF — malware analysis report

Static analysis result for SHA-256 91feaf70a4516ec2…

MALICIOUS

PDF

89.6 KB Created: 2021-06-25 13:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55eb84d88f5c7a5d3a99e139df6d8632 SHA-1: dabeacc6ba6f80077755e7cb2a1ac674bbeab05a SHA-256: 91feaf70a4516ec248ded7f3d17e450cf9d1b96076ee5ec1b7ce1e3f6fb94ad6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple compromised CMS upload storage locations. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/3c1377c2865bf99095509f2bb1e559b9/sigajakinoregoti.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d70a8ea51f1ad739f538cb8d3edd456e/68537012259.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/q93akkics68j3ul64dnfg655rb/40241370350.pdf
    • https://mosallaesf.ir/uploads/ck/files/nebutixasidaxigoxonupeli.pdf
    • http://technoculture.cz/admin/upload/file/19730735441.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/caodtb4m0nt4o8hrd66eshpbe0/turifop.pdf
    • https://x-software.cz/data/file/8915529597.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a17431e95a89f2f2ad0be3d780b2aaf6/potepilaludu.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/3e70cd2fe2e97ee19137b2ea623c979b/duposenumidizisumak.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607176bb914a0---7822789595.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/e68063579e19cf3635c9cbed5bdb2b69/65925393979.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/lampghb7i8cfhdpqi5a2pv12ve/92835457933.pdf
    • http://vodnik48.ru/content/file/bakonu.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/ceceb09ee2c7a711c6d6fa7461f6476c/wipuwadutev.pdf
    • http://brickchamber.com/ckfinder/userfiles/files/25113580398.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0tudionaemg5urui8lm1lbdja/jofogufabukamutebol.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b7kusbnv5so58pns2c7bd6bav0/medomig.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=months+name+in+tamil
    • 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_off0000faf9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF9 16792 bytes
font_01_sfnt_off00011310.bin
8926e5bf118c1317751247c379a1d48444b54bf12da8f7bec78dd6cc571ee1f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 10264 bytes
font_02_sfnt_off000129ec.bin
20da4e2604106e25a87ec838b8bdbff9804491b4a38974131e000bbfea1522d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x129EC 19056 bytes