Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e525833aadea78d…

MALICIOUS

PDF

90.3 KB Created: 2021-06-26 18:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7a01157228fc01e6868288c2a687b837 SHA-1: 4cf3925c2232e3d4a32605ff1bdbae8a87d8101e SHA-256: 8e525833aadea78d1ea01d5448ae3ba10554c465e494d023bc1f2aa760ae9aa8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081de8ac0bbf---93626193701.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882cf9458d8---42296070463.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd16ab9069---97858595046.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fbdb65613---zurefowerade.pdfIn PDF document text
    • http://splogservice.ru/content/file/66198923453.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/34084324960.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4bd101445---3859516834.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/vukefimofasojidumobod.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/67535rrrnfbheqgr3tdt55rjb1/53662288860.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079703f14545---31237661820.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/557939a2e31e8505269bc855ac0e6914/suwuboxe.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/su4q25r9kg2n0chof66v0okn0d/72364831801.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ad399ffd3---39816458658.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/radadiluwofekofudomulan.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/50687767867.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/55365099292.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/dasinuwufisobadasajalaga.pdfIn PDF document text
    • http://envigest.cz/upload/file/vomovutoguwu.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/44126758186.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/udq8f7njl7pq3kkvjb541imd06/68321127520.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/79789245456.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4fa2f6fc---mugowoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+twilight+saga+the+official+illustrated+guide+read+onlinePDF 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_off0000fde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FB 17316 bytes
SHA-256: 83ef606ecd23627effdb93dd8d4f32b4c0b448fd840c0690d92816566d8becb9
font_02_sfnt_off000142b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B3 10904 bytes
SHA-256: 97ba8764884077c39f05512d0c365a058e961a56120480331fc1eacae562c584

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