Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a632548ddbea4c7…

MALICIOUS

PDF

78.5 KB Created: 2021-06-28 07:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a7dab59f5e59a444308e9e7a709cd35 SHA-1: c30a836f3a40ca0e65b81f8b85d5cf3af440414d SHA-256: 7a632548ddbea4c70f2765a2dd005982240ac4108a20dc4c2c118868fd4238a6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV also detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous embedded URLs that point to compromised websites. These links are likely intended to lure users into visiting malicious sites for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=only+you+piano+pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/72fb619035c920c3eca77d106406b9cc/478575840.pdf
    • http://ats-dz.com/userfiles/file/30579454730.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/76q22g07tvgnf5aevnq4clars5/zusojerigifov.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6807064aa---kazapowoba.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080a72276001---28100731349.pdf
    • http://etkindenetim.com/resimler/files/56363666258.pdf
    • http://nc-israel.ru/upload/files/71182951896.pdf
    • http://videofilm-tv.ru/content/File/98666762140.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d3993c6c---48776474952.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096784a9e1b3---bodatukibewefosig.pdf
    • http://dentalclinicbangalore.com/uploads/waruxevelumigixagisak.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a625f359bc9---waloruxuranodetunobim.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab8d8b71a---88537062623.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-12/20210512120517744964.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ismn38sqe5v77as5lgh8ojitev/xusoj.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160920e37f0178---doxerizorupodugix.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b823fe99b74---tiredoredo.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fd0b336ee0a95d0ec482b74c02e033d/42229066128.pdf
    • http://on-video.com/movies/movie_data/file/95848386056.pdf
    • http://tcurryproperties.com/konadnew/userfiles/file/37370683744.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5574246dc---43812644441.pdf
    • https://agrilaui.com/userfiles/file/deronexoz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf96.bin
09917d645b7121d0b071b93fe94c01c3731b4be751fa8c9b9a6301dc3476cc51
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF96 17876 bytes
font_01_sfnt_off0000febf.bin
44ffabefe23a5561aaa47ee4fb120904c69d3b1c0096fd2144d50479fdc3c741
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBF 10232 bytes
font_02_sfnt_off000115cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115CD 16792 bytes