Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e63c163e9819bf…

MALICIOUS

PDF

96.4 KB Created: 2021-08-08 10:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4e4b0c8931ebc53ef33c00159e8a646b SHA-1: bc82dae4bca111ad8f1d82dc71c3055fc0fcced3 SHA-256: f8e63c163e9819bf70a6682ababdefbd1c79d6fc1428c65393c123da19c0f980
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://studioarchperissinotto.eu/userfiles/files/tesenanujepoditirelotebuf.pdf In PDF document text
    • http://tlxzkj.com/uploads/file/101249013927.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/19117992952.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609f89c2442e6---bowefomazuvonitovelados.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xakajeditozonulalarite.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/nawoxutaripi.pdfIn PDF document text
    • http://billsky.ee/files/file/givomowogimijexaren.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/733093a7dff39a13266de047048c4fc5/70361822710.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/topukutuwuxagul.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/1cfd6faf6d5a979d9f530eb3dbca656c/wifurimoxegevosepeliroriv.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1036d3c676---40176979217.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/37320982969.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d5436be90---babotifubopo.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/nufegitoramumu.pdfIn PDF document text
    • https://actorconseil.com/files/file/bomodekopajirunulirilo.pdfIn PDF document text
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/60972567831.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d1db5d28fe8---46720635060.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jidthnqr82pfk7v9gks3ua4f5k/56167138687.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e4fadb27f33004d6bf178b88181243d6/35049269256.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/12145142498.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/44505740239.pdfIn PDF document text
    • http://vodova51-53.cz/files/nuxomarebokaluretixode.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/tokulonivujojilisajerib.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/savijoziduzizanetux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bloons+tower+defense+4+hacked+everything+unlockedPDF link annotation
    • http://irodori.kir.jp/files/file/sotofa.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_off000110f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12905 17928 bytes
SHA-256: 2e833d0a488a849245dbdef2eb6d55b3027566454b55393ee24ce611aea02a7d
font_02_sfnt_off0001580b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1580B 11344 bytes
SHA-256: 14952c420c387f5445e4bdc87b4b0b53f4586a61c04414ff9ca4fb0d562c833e

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