Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72b6dbce89a8734…

MALICIOUS

PDF

83.5 KB Created: 2021-07-02 03:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ee1dd6cd049a5ef48e049e088cf28f6 SHA-1: 74ca5015bb8f2bb9f0c0f8117aa21bb85530c503 SHA-256: b72b6dbce89a873419d0ba93d78f4f54c5f7dccb413a604164166c7f6fe55db0
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://zaun-produzent.de/userfiles/file/51231308023.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/1434c9402e6585833b0e778c64bc15c0/jokabutikot.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd18b48c418---zevodagerubetemo.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/t5bmsa4o0agfqjvjjt881eeh0v/50409731005.pdf
    • http://vimbark.sk/editor_uploads/files/23507761777.pdf
    • http://teplolux72.ru/upload/file/78243175457.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/c5c3fe2213f54a1b17f2ac2fa7a166a2/25179749921.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/e4a51d8b6844128661b42e739385e9fe/nuruzupepuraxeda.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c6eb864cc---65264316695.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/bb81f3cce2f2aabc7dd234956ad28fc3/46422464602.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087a79151aa8---20766361323.pdf
    • https://tecnicadovolante.com/images/file/modozezupujigabig.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/4c0cd01e13102924f24d064bba5695c1/biporitutibidapedawibas.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609edf7dd2d88---64593316593.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cc93e1ebe6c---tutodidetetu.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/vukuwepo.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ems4pdoggtti0efss9p1km3mir/43725545388.pdf
    • http://toanlinh.vn/upload/files/dukonukupazojilelubi.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/9af2e4cbb317aff11b218ea038d3e8b5/detabiwonami.pdf
    • http://szpk.hu/_user/file/28147712075.pdf
    • http://homenet-spb.ru/userfiles/file/53144179602.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7db40b42d---13709884861.pdf
    • http://portamarioarchitetto.eu/userfiles/files/mitomurekezepokokenikixa.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/igi0gbkk3c3uip27cqsbls9un1/novizupitujituk.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ca2b8ddfd---45294411570.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc00d7891a---31659858568.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=tree+of+blood+1+01+41
    • 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_off0000e438.bin
45a4e5296a7c6db1c191edc47ba2b62737b2446a77de637a0e637fc6d75c9afd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 17720 bytes
font_01_sfnt_off00011251.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11251 16792 bytes
font_02_sfnt_off00012a68.bin
34e3be8a992582f1ea7a413964eb8d3048e92983a3a49338008ccfb1c134f4ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A68 10076 bytes