Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ff1556b3dbab4d…

MALICIOUS

PDF

73.2 KB Created: 2021-08-16 12:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f2931d90d0efcacfd43309c64763582 SHA-1: 01e0a524d4d7048165ec96bbaed85adb097eeeed SHA-256: 53ff1556b3dbab4d381624c6722d93eaad31e6348090d593db29aeb43d49e9c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to manipulate search engine results or drive traffic to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://catamma.ru/uplcv?utm_term=how+much+is+it+to+rent+a+car+garage PDF link annotation
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/85fc9289e9ce6a3cecd5f0a78d87d233/59919401623.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/20310079155.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f93ef808ad9---gavosewanaduti.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/kutejolovej.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf6a7b6ae---ravawafugebinup.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/bagaxoris.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/lanafakekalopariwokaxufo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06a5764c3---lamitesozujibut.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac83285f9---sufinasuja.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/jafab.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/71449293979.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb7e0b6db---81065799724.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/52316766705.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mekuzorapogoniso.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/zinomi.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa282ef737---58308178188.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa7858a449---vurawezezevinupofujo.pdfIn PDF document text
    • https://nattasampun.com/upload/files/vasufe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4cc8f0cc0---gimiboxamukomedizexas.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/98348651719.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/degon.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_off0000bbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C4 10808 bytes
SHA-256: 00a2d4966142357d6fa95c970be003d23a5d35183c499b70e40c781683d53a31
font_02_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 15952 bytes
SHA-256: 8bbcc07cf7e6cbedba6c2879138527f4e3c4e12bec5d2e64a5863bf87b2b6218

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