Malicious PDF — malware analysis report

Static analysis result for SHA-256 4827203eaf9cb6c8…

MALICIOUS

PDF

80.0 KB Created: 2021-09-05 07:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f31e6da32583bd4d3ae5e61fe0ed57dd SHA-1: 512b29c9afd5016e25f256b4ab7056fc1561f0a7 SHA-256: 4827203eaf9cb6c8ee338b3c4df1d8125664c6c3146fb3db8ccbb809227b9013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links are consistent with attempts to trick users into downloading further payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pixomot.ru/uplcv?utm_term=teknik+1+gleerups+pdf PDF link annotation
    • http://gesundezellen.de/neu/userfiles/file/rozajuvefujedevowudotofe.pdfIn PDF document text
    • http://protok.pro/upload/files/85796714930.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e85d84a76ea---66072111671.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161323c2a8c2f1---86260104257.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/56677941659.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/83612168735.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/80e3c9b40735b1cd0dfe979bef269b2c/filivubafikajevozax.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/37980435891.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/40633810549.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca673eab8d---mirix.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/b6e999bc6eb088099f484ea63530b6eb/lenubozunawitixiruto.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/34928975476.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/50664378912.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/14571780669.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ce70cdec2201281e9b0da7d6d438d325/dikux.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d88ee2f93---xovebipoxedu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/l7uivqg537hpk1gehpp5isgubq/13467124590.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/68879901838.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/89449018228.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/192649164afc8bedf6ad9eead4b425bd/sipalesozisutoruzovaxero.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/7uqmg37mhea9kbq82h3md2kjj6/66241095501.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/kavivemidijakuwu.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/uob0ckjf2j2j9it4hej5mtbd3l/35963871452.pdfIn PDF document text
    • https://tarsiman.ee/files/file/kifizozofaralazutidefu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160924cc0a876b---jajaxubugu.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_off0000d1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 19040 bytes
SHA-256: 720e2d79b2f2cdf41796e1605f5a2e8eca78a6d44baed52f8ee20e4c2acb576a
font_01_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 10500 bytes
SHA-256: 3c3aa8c2e62a680c487dffc19deeacabaabdfd37104ac224f02ebacbbaa9358a
font_02_sfnt_off00011aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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