Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a817eaf11ffbb5…

MALICIOUS

PDF

86.2 KB Created: 2021-07-02 05:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36e74444adecdbb14e7b8c8d2b7a202f SHA-1: b9a2d43a7c0df30965149c135ffb25311f02ca3e SHA-256: b3a817eaf11ffbb527fe0d159a3b085cb07db9022aee7b1083986b1f9d36a9b8
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 ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to exploit users through deceptive redirection, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a294d8c19---zowugajes.pdf
    • http://stroisvias.ru/userfiles/file/30660376060.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160805a9fedb64---20272521823.pdf
    • https://lawrenceyezersky.com/userfiles/file/giwemadako.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/f6254d7aebf3105272f3c222d42c97f1/wibulaza.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/jizubadopunus.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/ba8fe25b427064e47475d2260f847d32/86001391074.pdf
    • https://penal-garazh.ru/files/81126412110.pdf
    • http://aeronautike.com/userfiles/file/namijulezef.pdf
    • https://whiteplacard.com/UserFiles/file/xosilividir.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c74d9f3cdc---22688854530.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/bacpjpfhl99u2n2vfqviqpo8g0/tuxezurodugajiz.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3815b4a3b5b492e4d88005b7a86148af/zonotilu.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/8qb7564o6jthj5lt3pa0m8j4h0/susolibeneb.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/5n5v6kb7lnnhp14k8oj1srvhii/bofamiwefejutaj.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/957a069674da947636a8951abe40e052/soxakija.pdf
    • http://cosmik-kino.ru/sadm_files/joguwurunajop.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608af8365a45e---migabimuxopasojo.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4sb80ibhjpfdorrc41g62f1t2c/70286632832.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f70469b4a2---loluzagefofa.pdf
    • http://syuncyoku.jp/upload/file/guvonemer.pdf
    • https://proxus.nl/file/10579100150.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/rotezorixajanuk.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16071f913ebaf2---sexitavunazem.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+13th+amendment+to+the+united+states+constitution
    • 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_off0000ec37.bin
d116e697f7e7e6d4fd080c420ac793074c973b3bdaee8e55d1e47bf0875da821
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 10776 bytes
font_01_sfnt_off000104f1.bin
b39aa60404e4c9336b8542dc610753d7cbcb3fa7cf587f8f5d84fa53e5ea4b74
pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 17744 bytes
font_02_sfnt_off000132f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132F6 16792 bytes