Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8eb262edcbd026…

MALICIOUS

PDF

89.2 KB Created: 2021-09-11 06:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dcd291f8fe8e2d8df10016837a11ddd1 SHA-1: e4c6acca56819cc02bf291c298be6cb7cef54002 SHA-256: bf8eb262edcbd026970e87a9a2cabb8300f98ce914740a80e9fff8f7d83bb7e8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised websites and disposable hosting. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=after+life+movie+free+online+watch', are likely used to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=after+life+movie+free+online+watch PDF link annotation
    • https://bodegoncriollo.com/userfiles/file/pukijaramijenofubok.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/mumugimemavugejokarugowe.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/mapukemobubutogegos.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/43957329023.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/87078124571.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/vomol.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/4581790095.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/limowazamugogo.pdfIn PDF document text
    • http://holzweiss.at/lavixasepozi.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b5ce5ef27ee146dd39fa1eaf0e52cb37/pategezifojawopek.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/judopikediruna.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b0c862032238263f5a1ff049198c9c0c/purexasadoru.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/wigijifikifojowemavi.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/sirumepokovamuler.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210911_0E593FCFBA88DDE7.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/41259446415.pdfIn PDF document text
    • http://unibox.lv/files/text/27690320132.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210902_023C3118E367D7E5.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/sidifivilugudupo.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613509327f6a3---55593409486.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/45093465657.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/bowusifi.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/mejajetupijidiwo.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/bazutopavaja.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/fezegamuvisuve.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_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 17968 bytes
SHA-256: b82814d968ee12aa83397613492e23533d4e6271d126553d2040e5a3225f29c3
font_01_sfnt_off000126f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0E 10564 bytes
SHA-256: f8ed0a493ae39e4914ae1eaada51fd5ec6c76c584e0dfda265c8cbcaf4f05c32

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