Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1c3076bd36d019…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 15:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd2687813b2fb82b292a94ac0fc6813e SHA-1: 75a359d2518af4e7749226b7365ab8d9541f115a SHA-256: 5f1c3076bd36d01976aa88e17f56d7ad9f7738d319ae40cb3e2adecacbe08cb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs and link farms, such as https://drafthe.ru/uplcv?utm_term=failed+to+send+text+message+android, suggests the document is designed to redirect users to potentially harmful websites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://drafthe.ru/uplcv?utm_term=failed+to+send+text+message+android PDF link annotation
    • https://ivanamihic.com/files/54950557018.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328f7017037---zutegurovewiromubebipod.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613118b718bfe---98102878509.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/vosakika.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/mifolebej.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/96931849600.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/dobefubokovotowokozaletes.pdfIn PDF document text
    • http://deforma.it/userfiles/files/pitigezomitivixup.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/75751151441.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/lavisabanupu.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/jejetidoxawekamap.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/327926808241631083651.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/tulaxifi.pdfIn PDF document text
    • http://mobilenmr.com/files/files/nobejurixemubugajawo.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/37800629362.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109131326581845.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133c374cf645---nurotijemovigi.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/19845739873.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/tusibubekig.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/rodunamo.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/metinejiroved.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/38503897119.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/sujaferajif.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/3da94d8565ca6dcf8943b318128281b9/37833742744.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_off0000e00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 17904 bytes
SHA-256: b527e2bb12463d73631f42b82ae37185a304a8ce6a197df7554f2b90c5f73fa4
font_01_sfnt_off00010ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 10672 bytes
SHA-256: dc6ccfeff127ccb3e3d92619c1297340443740623b87e2a663fa980952214ebe
font_02_sfnt_off00012707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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