Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b7365fb9cfb447…

MALICIOUS

PDF

89.6 KB Created: 2021-08-17 23:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf85125b0b139f0c833b93547646abbe SHA-1: 85bb5e280a987567fb30d39dacb073135f999d98 SHA-256: f9b7365fb9cfb4473ce94f14cb2b6085ddad929871512359f8062f3a4bdd41b6
236 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. The document employs social engineering tactics, specifically a 'ClickFix' lure, by instructing the user to copy and paste commands into a terminal, likely to execute a secondary payload. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 https://laborke.ru/uplcv?utm_term=how+to+set+up+dymo+4xl+on+mac PDF link annotation
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/ebe2a5028eb0670cfd2ef56dc5f45d95/93846918923.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/11086487390.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b276c685f23---14155578501.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/46699905592.pdfIn PDF document text
    • https://zzwgjx.com/d/files/nenepaz.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/bufoluviki.pdfIn PDF document text
    • http://www.heksan.com.pl/file/23618138771.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/39dc9ee75075a6b27629b48350e22972/50761767596.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/06/19/75409313673.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/19660032382.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/rk9mksdpbs5g4sqi2nbco4ac72/wipizudofevalinenigejada.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090a872d8ce6---96472544332.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/1366220557.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/78234777230.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/e124e21323f4c14cb51861176bb9d72f/nojabolewilu.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/48434078050.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/s0d57l6hbq0rg2g9n4f6d885pq/82653517043.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/35343460452.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9ceaa37c2---77620842235.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/61477334423.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/cg4fijrimahsnkmkimu8o2f7rm/wagunolabemuju.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/fomedalamisawibifasiboji.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2b307e067---lituwejaxaxizeripo.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/04b36a40400d79b7d47074d6324f0b39/80317785206.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/21a4108edc8832b18f09f93cbc8a47ac/dezakoniwu.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087694a8d595---69650730519.pdfIn PDF document text
    • 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_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 10952 bytes
SHA-256: 8e53b9ec4b3a081d712555c624acacc09d98f2d18ad826d0e9a8c5c712fc9c81
font_02_sfnt_off00012ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB0 17244 bytes
SHA-256: 41ecdcecea56f778cf3e43b0ec34ef8c5ad480c26b28d0d765ba6adfff94b644

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