Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e00ac96bc8a469e…

MALICIOUS

PDF

90.8 KB Created: 2021-06-25 20:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f52f6ed5319b5e55057a6508a1fe9a6 SHA-1: ee2f7793be6bc1420bb8a20edfd65bccbffed3bb SHA-256: 9e00ac96bc8a469ebf0ee703650a4162a6be7e102df9e9ffe365465a9c396c5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing a link farm, as indicated by multiple heuristics including 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links point to various compromised websites and potentially malicious PDF files, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://ajivikafinance.com/userfiles/file/59698921193.pdf
    • http://tubietelbar.hu/uploadfile/14320038857.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8e1ae81e6---wabuzonukemezunava.pdf
    • http://elesud.it/img_pagine/file/bufurejodotaxunenagu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d96a7a0d---42381514702.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c999661512b---83670335235.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c7336bc952fd175b1d7ca99d77582ea7/lagoziniseximaxamowuve.pdf
    • https://adepotcustom.com/UploadFiles/file/20210507053459124.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4432889448---nevonosaxadivukefepupogo.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16c3abb0d---80154064437.pdf
    • http://ipceurope.com/assets/file/47239853355.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/0c596p4g94l71nc7i73c4rv3dm/sagosurakozod.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/3a46d6a89c981ecb610930dff38d04b9/tavanav.pdf
    • https://atraba-holding.com/userfiles/file/bubanusidimopax.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b614737e43f---bifeloreredixomukaxivuf.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a0ca68852---58456665436.pdf
    • http://whatdwellswithin.com/file/ralerun.pdf
    • https://festival.bg/fckeditorfiles/file/lapitepedudogibani.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/vabawexoxozupalerar.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081c5ed75619---1650445671.pdf
    • http://kusadasidentalclinic.com/img/userfiles/files/56695179493.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/0a413f7e0df70665e93d34fc419888d4/35012294223.pdf
    • https://ktmcollege.org/public_html/userfiles/file/30895043399.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=china+securities+depository+and+clearing
    • 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_off0000e80c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 16792 bytes
font_01_sfnt_off0001001e.bin
3c665a17d1ae64ae32febcbec8602df33d0a467a5810070bc7e685f8fe099b29
pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 17808 bytes
font_02_sfnt_off00012f38.bin
46f47c931839b3bbf40760289cb3e1498b60348bc1b1de7fac9e4234777dc7a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F38 11036 bytes
font_03_sfnt_off000148a6.bin
983684095fb61a8c3d8500fff0bac7aea7dda2a5d4eb431cc164c008ef67a080
pdf-font-stream PDF embedded font (sfnt) at offset 0x148A6 5896 bytes