Malicious PDF — malware analysis report

Static analysis result for SHA-256 5baa42b77631fb19…

MALICIOUS

PDF

90.9 KB Created: 2021-07-05 21:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 396258a0baf64d9665b62d33384cd8d5 SHA-1: ea9edd17397c137303bb2aeff66d8bc1561001c5 SHA-256: 5baa42b77631fb19663ed593415418b271716a7520cf241cf3cfbbbecff2713d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=weather+at+zion+national+park+in+december PDF link annotation
    • http://nhs-carpediem.com/clients/46367/File/nomegikabefuneno.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4801db119---94949985434.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/kawoniwupebujo.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/93884036524.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/65944805386.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/dc1166ba5817a577bc1cea1dd8267e04/dotosokewemowedogom.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/47768489566.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/fumixav.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/re3juermasosha2oatnhajirj2/nefojupuvupegeb.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a5299fd85be---wafoxolisapomixuzupiv.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/85681863199.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b447b03a6c---96060058808.pdfIn PDF document text
    • https://hse.tw/upload/file/sepuzefegufi.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/31729267167.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/dorefuwubob.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/olfuofm8ms2n25463l5jvmdhgj/10474109043.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/liguxitejarorat.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210623_E3E648E17FE28CCE.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd87bd74ce---46509152316.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/mosujujine.pdfIn PDF document text
    • https://oversaslogistica.it/file/gijopile.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806c3ae5d71---rozipuvagupedisafar.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/daadf14272f4f76a0810bc749d8db91d/24635824148.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_off0001007f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11896 10896 bytes
SHA-256: d9ff8b32eead3fa735621ade1655eb587753ccfd090854ff01e709b403e050a0
font_02_sfnt_off0001315a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315A 17212 bytes
SHA-256: fc89ecd77008c6d891167b8d25f7431c2bfc8232b85f72ff30a2b3f2a0c6f0e5

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