Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61cdabe12947752…

MALICIOUS

PDF

79.1 KB Created: 2021-07-03 03:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d54160aed77df3d13bfe2d4298d1aa1f SHA-1: 4b2d3fab0dc26f2b7d89153697c70874f5029827 SHA-256: d61cdabe12947752d5ce568b070a5e12db327fa91e3d2011e2a0a54d62dea977
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://tenshinorchids.com/FCKeditor_upload/file/77290722627.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/46p605qcjck2obr041fme6pf45/nusokoxufizifejiw.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/46705892424.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/58856790358.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4e7d6a37b---kejajexudexi.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c209e7115ff---nufulizusi.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/a9d679bd671ba8f3530fb710f0c6bf1f/21911814206.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/db5d56ca8fbdff59c950b0c9f1b03d00/19312106127.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/535ce6a3c2ec4d104a11a378db9afdfb/vepaxidiwarosa.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16071c0472224f---54726405600.pdf
    • http://a-swiss.com/upload/userfiles/file/22969260450.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dba1c43fd---96794348883.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/2u6orv1onqccsa6g9gbaha10n2/16807222840.pdf
    • http://svaz-podnikani.cz/files/file/45891173362.pdf
    • http://activesolutionelectric.com/images/file/90462545327.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/rawurukapa.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca08af62a---fimobe.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8e675bef---wufixenamu.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/4296aec417ca250dce15abaccf526d77/tofelujeb.pdf
    • http://ipceurope.eu/assets/file/81835502588.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e577a86ef---41919431271.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/f88c2ba149c7a827cee7ea3e9f579322/65613548085.pdf
    • https://apsco.ly/userfiles/files/zovutu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=a+sector+of+a+circle+of+radius+12cm
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b950.bin
d1ff55f592c4bcea43ccd85b360c3187e32f6098a5c2e755fcb085bc62ff939f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB950 16224 bytes
font_01_sfnt_off0000cf2b.bin
8716f95f547d78381d2cf762e81103239c7d344ee909e40392958b048d2bb323
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2B 10788 bytes
font_02_sfnt_off0000e82b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 16792 bytes
font_03_sfnt_off0001003d.bin
b00f50c322f3d1d9dc5c76195c73a8abd1ae06201b355c66c7ed7d3b06b1b3ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 17372 bytes