Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93dc4b9d3daf2b9…

MALICIOUS

PDF

91.7 KB Created: 2021-07-28 14:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3453dec96f7bb9c425ee0b1de5d2d8e0 SHA-1: 35dbc3770dfc92ed87171bfe48026b8f739ed97a SHA-256: a93dc4b9d3daf2b9ffdc863475a58fb7583be161bb7bbc009a8ee9576bf0459d
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely intended to host further malicious content. The embedded URLs and the PDF structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f97e058f99---61306316915.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769bdc355ed---xexomitizelorogegeza.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/61voreggs364j3qpk4mkauls2c/kebisije.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/povomukobedaxuzuwujejidu.pdf
    • http://fitviewer.biz/files/file/20763039393.pdf
    • http://htwy.com/upload/file/resoresipi.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/567f9ee98f8c193753f0306b3e040bde/padazut.pdf
    • http://studioego.cz/userfiles/file/kupiludomiwanuwepu.pdf
    • https://hanyauntuktesting.com/contents//files/94956477237.pdf
    • https://artbynela.com/uploads/file/fatuvimufunalalenu.pdf
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/26832225821.pdf
    • http://atallmed.com/userfiles/files/zanideguxejowagor.pdf
    • https://davaocarrental.com/images/file/77384261311.pdf
    • http://stlnsk.ru/uploads/file/lagizizifizif.pdf
    • http://csc-0411.com/userfiles/file/20210621131316_ro862s.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080a89bc3afc---7396720257.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/61147381982.pdf
    • https://airbays.com/userfiles/file/sonutuvisugimenetowefev.pdf
    • http://tweddlefoto.com/files_contenidos/upload/files/51557148811.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/3bkhvdtksgs0i8senh9a13l9al/74572045992.pdf
    • http://merlegdoktor.hu/tmp/vefekikugofotopewafufega.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6530379b5---33515451204.pdf
    • http://syuncyoku.jp/upload/file/38456519644.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+hook+up+vizio+sound+bar+to+samsung+smart+tv
    • 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_off000100c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 16792 bytes
font_01_sfnt_off000118dd.bin
e384be1500aab82926c191ae5058d7e62e497282e06a7c9d4f004c2e1892df6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 11196 bytes
font_02_sfnt_off00013284.bin
27e4f9aa56e4f864de69362d7e890b540dbf0e722eb5d228d1003c5a965c742a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13284 17572 bytes