Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a12bd2d8d0adbe3…

MALICIOUS

PDF

87.6 KB Created: 2021-07-18 16:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0f5f1ca83778027dc543cac7a65baa3f SHA-1: bfdaf5d539b6125712687629f02b28c09299ce09 SHA-256: 4a12bd2d8d0adbe38cab469786b1c29f778a6ecd09b4060d3bf0d1df3a168c3e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various compromised WordPress upload storage locations. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's content is designed to trick users into making a phone call, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33896a29c---sobiguzurevoxaj.pdf In PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/da0eb5df63c31b89f7eb0c96ee1793ff/512776819.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/64754473648.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/p03uohu00681hfenrvukgsdi96/vajixaki.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021043001445719.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/tc85roeeq0vu505q73cls3spks/luganeradopowelugopidabi.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/49732047906.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/0foo5mvdtp58m228lthv5g91d7/49862940173.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/fegozodudufuseride.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c63212f029e---xudosunizaxukexib.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e679dbd9da---bogidunodijotoza.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/fezedururazemifiv.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/052949a1a48ac48f735f2f7d0b0608a4/81030063290.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1625667317.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/dudewinaze.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5838b2da01---15833377060.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/p2vr3scuouuesih09748r04846/biwudokununo.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/kesenizofusogipetup.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a42aa4cb2---polawuvowixoviwu.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/17934492150.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/670c3842e3b5af2da0939b400bbbfa91/75350727950.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-20/20210520175829350119.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/lojozapukariraz.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926ac4175d8---84471502701.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/2c02e7bd0d7687a23b73c2eb598c8f9a/davaf.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbf70ed031---vitogosajivun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+check+when+license+suspension+is+overPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 17096 bytes
SHA-256: c1c398b56ffd14d1539936b25c4c35bda1d9894c6879dc8e6376c14c9e6efaa7
font_01_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 10644 bytes
SHA-256: 444e8e17cefa8ef68272ad902e2a79c34ccc11b56c5be2c53c2e6d8d9586184f
font_02_sfnt_off0001384b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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