Malicious PDF — malware analysis report

Static analysis result for SHA-256 feeb7fc433d375ad…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 15:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e4a1776d493c4166a1fce554c5b6652b SHA-1: 452324db353997560d8717586143758fc770253a SHA-256: feeb7fc433d375ad3e7988fe4acdd77c8d4ea7381d3030cc16b21a56f84c33e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous extracted URLs indicate it functions as a link farm, likely designed to redirect users to phishing sites or download further malicious content. The presence of compromised CMS upload links and disposable hosting further supports its malicious intent.

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://coretry.ru/uplcv?utm_term=fernando+pessoa+livros+em+pdf PDF link annotation
    • http://kanchanaspa.com/ckfinder/userfiles/files/19703921168.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/68723818913.pdfIn PDF document text
    • http://kmsenior.org/file/files/ranuzepuneninog.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927f5b662c1---16618831266.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/32d072a00f01e0904330db087019c059/25996980653.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a522132a6---genuguniduvotewe.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/2556129550.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/38589345052.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/98407792975.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/53292117597.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ddb2842b1---61120884642.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9523e29ef---jaleg.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/23588804263.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/mexefepisotituvovap.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/ng3segc3te9pltpmadom8hvp7s/dopijariji.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/503832289d18bc80be2b250052cb1528/80384250062.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0ec4b583---32683454500.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1624505300.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d4251d6f6---surexubufid.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/66839051414.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/diduvoruratotiziragewe.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/25102068476.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/xotimulibanop.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_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 10604 bytes
SHA-256: 1ff6163313830081e3e54479f236d1d3b991f68c3e83dba9a15fefb2cbabf6f3
font_01_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 20788 bytes
SHA-256: bb3dc08bc7fbaccb19456011a42373dfdb2633598b5e2dac04670884fd3eb52f

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