Malicious PDF — malware analysis report

Static analysis result for SHA-256 22aa333344c199bc…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 02:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de8c0628409a7668cc4d6562cb7ed491 SHA-1: 98bc5e1b4f9fb1ab1d6e5259ff7269c92a80dd71 SHA-256: 22aa333344c199bce47fbe43669fdf10094f8e0c7b53c05a643b8d93f2f26104
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=no+se+puede+abrir+el+archivo+android PDF link annotation
    • http://quaisetoiles.fr/img_pages/file/wozositigokanu.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/76389725270.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b2c4c46c903da01249eb7772a91a9b71/99481202009.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/fadepuzunobudaro.pdfIn PDF document text
    • http://gdgom.com/upload/file/210901215021082560umohk75ioj89.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/47972986722.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/gojevosuletirigelekegur.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/retoxexatalogakaxerexawiv.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/57040019894.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/tabutisebirikolixopon.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/sexabuz.pdfIn PDF document text
    • https://ikansambel.com/contents/files/galaxixemu.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10366033505.pdfIn PDF document text
    • http://balalajka.nu/media/sasivowigafumidosukadudo.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/63795035250.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/53767893956.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613964862bc39---22094312413.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/solud.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141749e8d311---60171771823.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/56202850186.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091121100454.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/48e7ba3b19e16d40e620fcd8a4635530/tanavemijusemalivudufuge.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/71415923663.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_off0000d1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DC 19228 bytes
SHA-256: a278fefe2e5992c29b4e786efc9bc8eb7d0b7fbaad171e8b3256dc7579b2c596
font_01_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 10796 bytes
SHA-256: 923ec9a113647a62a53d0e387ff606655075080b280ae761b1f985b90ea32bd6
font_02_sfnt_off00011b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1