Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d191dc2ded51d4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 18:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5acd17b3415c0d0b77de216205efae6 SHA-1: b41568c6b44a5344d1c2fa127444d5399c6c73ff SHA-256: 82d191dc2ded51d4e1646335f3d4e9ba14a437fe7739ba91a36bb20f9f1e1138
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1110.001 Password Guessing T1555.003 Credentials from Web Prompts

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a credential harvesting lure. The heuristic 'SE_MFA_LURE' strongly suggests the document is designed to trick users into entering one-time codes or MFA approvals. While no scripts were explicitly extracted, the PDF structure and embedded URLs point to a phishing attempt hosted on compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://korealabels.com/ckfinder/userfiles/files/26031650998.pdf
    • http://abc-tel.ru/data/File/25547955865.pdf
    • http://climacom.eu/userfiles/files/suvizexowavemewipuf.pdf
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/mozozatabutisa.pdf
    • http://drsuthichai.com/userfiles/files/denin.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/10758406903.pdf
    • https://sinarlangit1.com/contents/files/watifafepigagi.pdf
    • https://jooli.ru/ckfinder/userfiles/files/dafoliruwulikuvin.pdf
    • http://zoop-tech.com/ckfinder/userfiles/files/rabuxavotawunoga.pdf
    • https://lean-ds.com/upload/editor/file/9606686545.pdf
    • http://cauthangdep24h.com/upload/files/40404209213.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/cb1c45676a29c9184fac45c91eeb9e76/jezomokurubukujiz.pdf
    • http://sendedianqi.com/upload_fck/file/2021-9-13/20210913070245835875.pdf
    • http://rsst77.ru/upload/files/xubajebibasuxefudizasipip.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/34edeb624551cea102bbb1dda68bd281/66969695283.pdf
    • http://espwireless.net/uploads/file/87311078969.pdf
    • http://azizolace.cz/images/file/gesurugewimis.pdf
    • http://behtarinekhodetbash.com/files/files/delizavine.pdf
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/27536984848.pdf
    • http://getwealthythisyear.com/ckfinder/userfiles/files/nerasivugumasus.pdf
    • http://www.hebrewforreadingcomprehension.com/content/zobelamik.pdf
    • http://jobsandhi.com/uploaded_files/userfiles/files/piferurapobu.pdf
    • https://fotoprint.lv/downloads/file/64198041920.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139b29dc527e---kudogomalidupagukaze.pdf
    • http://www.tekkoo.net/images/library/File/dikozolixagewutis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=imo+old+version+download
    • 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_off0000d4df.bin
e32c225e6ab98376ba896e1754d34178e1505b9354333eefde9fcc712fc50c02
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DF 17436 bytes
font_01_sfnt_off0001026d.bin
d9060fe530267c1a579e580bbb631d5f02ba8f4ff7a3c34454209cc7bb46dfe3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1026D 10412 bytes
font_02_sfnt_off000119fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 16792 bytes