Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f091c767709b5a8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-02 14:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0280422b346c5460173db4502e718259 SHA-1: 18019b9cbb4c525762724043f94f94025ed0957c SHA-256: 1f091c767709b5a895057eb4425ce556298a445c0d6a91ead9acc1a7db9a832d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, with numerous URLs pointing to compromised or disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were directly extracted, the nature of the links and the PDF format itself often facilitate the exploitation of vulnerabilities or the delivery of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dodomacnosti.net/data/file/94649135792.pdf In PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/kmrnkqtiopv6oh8dl8lfj6lq9k/28368725386.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fdc293ceab7---68114378001.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a13df33838c---jolin.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/5054849685.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/reduzafivapawugixom.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8r93gn7smj0sh8gnnrlpdcogg1/xenujifez.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/vomobomakegutakan.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/niguv.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a58da610b4e---zixinexurowunose.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49860366744.pdfIn PDF document text
    • https://tonitomov.com/picture/file/jurera.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a93cd21351---98297112772.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/4568618717.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/vumafex.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/2ac0eaaf07b6c26655aa047c63eacf2d/26195436221.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/25519472549.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa6a78432e---foranomotipemakopos.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/27401564361.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c888426518---jonebafedutewapekid.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8c104b8e0---65293066584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=combining+pdf+files+windows+freePDF 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_off0000d4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 10836 bytes
SHA-256: 6eac6728138efaaba6f110b026d986ede454601f18c3a1d68e922c6f92947af4
font_02_sfnt_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 17716 bytes
SHA-256: f0d78efc6dbf68943efa4bb11638c60890a27e54efbbc7f471988da88867df52

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