Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dfbd5ca40a8b815…

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 22:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f869f3cb36adffefdb85fa31df88d53 SHA-1: 1bd70b01c503e6322c9bd2e8d0490aebe05ce766 SHA-256: 6dfbd5ca40a8b8153242b3cdc228b8cc6bb339b67c4a577cc990dbd8b5fb4981
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/nqi0ofkj9bgfcrlgisru8cudo6/84403265065.pdf
    • https://corpusbg.com/files/fck/file/32355078409.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/39heus3t8vvb7ja7b2rdirv4n5/ruzosekubikinibuzujuxit.pdf
    • http://ihvanturizm.com/rsm/files/mesidudokulapezivonowit.pdf
    • http://dagmar-e.de/userfiles/file/22082036035.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/557292f6428a3289b6b8c6bd0877bf1d/57889871867.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072196e89009---jikasuwejakolaxipinizu.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e59cac8bdf---kimovi.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4qh7k0suo34tn4hcl982401mq6/surebokedure.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/c31ba02d047e9q4q09pa0e49d7/kaxolewavopo.pdf
    • https://bakwanudang.com/contents//files/57735467815.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160818db13bb26---xuzegi.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5c9b830d---xolukinasaki.pdf
    • http://tunglamgarden.com/images/fck/file/19874046621.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7520af046---jixatuvawajatuwuvufeva.pdf
    • http://solarexperten.ch/fckeditor/editor/images/file/29233114203.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16081f94143ee2---37480663604.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160856392dffaf---vujumin.pdf
    • https://maintogelonline2.org/contents//files/55627964320.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609806da260a8---74825581776.pdf
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/sobotanefijadikizeguri.pdf
    • http://namthangbasaltstone.com/uploads/image/files/70678909783.pdf
    • https://condicionamentofisico.com/arquivos/file/pilalepemivekinogavib.pdf
    • https://studiovizia.com/webroot/img/content/files/simitepumanuvamanaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=eyes+blurry+after+exercise
    • http://pro.ovh.net/~tribuene/images/banque/file/wobijigezowisizegijexis.pdf
    • 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_off0000f75a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 16792 bytes
font_01_sfnt_off00010f71.bin
3606dea5ea8ac795fa14e838f92f4b1154012ba8baa875f90fc28215a6b0a179
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F71 10544 bytes
font_02_sfnt_off000127b3.bin
43987a8b7a7ebec81d6a6e99bbde825f69d85229b5b561dd0e80e0cad13cfe59
pdf-font-stream PDF embedded font (sfnt) at offset 0x127B3 16404 bytes