Malicious PDF — malware analysis report

Static analysis result for SHA-256 6493bfa38c904a68…

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 05:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fbd140deb80efadbc7c1cc6ef35039e4 SHA-1: 74d1a706441c14f7d362cf347a9a12efdef93959 SHA-256: 6493bfa38c904a688401649426ca59b9b5ecde4f1b5e503fab3ba8513f29003d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://garglob.ru/uplcv?utm_term=ethanol+from+cellulose+pdf PDF link annotation
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/85252e68b0b2bbf4172aa0fdef186906/raramuk.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/gugurixajomifuv.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608843fddec6e---45116364722.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/mibireru.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/18814639973.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/878d260c3b45d01c69e6f605c85905ec/53162173570.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cdd71c542---xoxudemaj.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce8dd61ddd---puwitaxavebovulisowikuv.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca503a588---72456251157.pdfIn PDF document text
    • http://budka39.ru/files/85658726990.pdfIn PDF document text
    • https://emmaushuis.org/pages/xivunumedewiz.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f577cc07f561ff608b36d90307fcd90d/tifabogijesijutugixunepas.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/gipezapufo.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/gukalevifomebopalip.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/dikixodogo.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/78804034798.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/wovalu.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/vevoromoruvefu.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/38073781141.pdfIn PDF document text
    • http://heatkings.net/fckpic/file/pegujobupat.pdfIn PDF document text
    • https://red-adlay.com/upload/files/xanafuwominomewoweja.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16081aaffa88f4---lixigunuja.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/fiqvf9fpa5bl41903oh2umseae/rizetu.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/wirofowetegaredubaf.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/pijetigosoxonag.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/4d6e7f1155861e67801e33bf7d6ded5f/kilofomokubim.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/79338821495.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_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 18692 bytes
SHA-256: 6fcbce45d164004dc40199f096f7c7a59018365e9364ff582a955d68bcea78bf
font_01_sfnt_off00011424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3B 10876 bytes
SHA-256: 14317fcbb5a99d1a7c442d004c83342ccdc304536f222c067d2e05818687f5e7

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