Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd4ec326d619ac1…

MALICIOUS

PDF

74.6 KB Created: 2021-09-07 17:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 620e952c871c07b31b573caf85b2e696 SHA-1: 3d08e5775dc0cde6290fb4a28752a7aa99a3ad6a SHA-256: efd4ec326d619ac1bf53accf98090fbae1aafaea8fd5be0f1ef67e62e898cf4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple links on disposable or compromised hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • 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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/um1uk1me6c068oeme1evuei87v/17866352978.pdf In PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c332201ed---40482184908.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/54793711914.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d2ed1725dea821c312ac2b5fa1305d89/dupojataropajab.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/budagodazizegopo.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/kesesode.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a6836285ed66717129e3e4b7dda55db7/kerovasevawujikexuvu.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/62899397511.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/tufefaxurubijovosujiduj.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611da3b427dc3---26578991608.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/dobajuza.pdfIn PDF document text
    • http://indel.sk/userfiles/file/48169004284.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/d4d13fda36dde2d6e81c5f7d5f0ca0ac/deluvuresa.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/poloxa.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afc14945062---xoxisatotezomizipegof.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/431b3c4073dbe3cdea6932ea9cecf3a8/poduk.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/rinugam.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/37264144418.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/gubojefozuvuga.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/sukogulurapun.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/37730386634.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/44132548280.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/34373690319.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/vazereluponidomitipuji.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/boxetolot.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/65d93992fa1b687a34548cb727d92397/torizipen.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/33585256122.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/41554393124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=manual+operation+meaning+in+englishPDF 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_off0000b8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AF 20008 bytes
SHA-256: b589cee230792ef438f7effacc4ba2f9e13e301d97ae015b8534b4cc5f96ec77
font_01_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 10792 bytes
SHA-256: 3a512e7e5b22391b1d0601bc73702be1d1fe13ba3aa038c13cf9bddc814fe29c
font_02_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1