Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dc32104f106fe9…

MALICIOUS

PDF

85.6 KB Created: 2021-07-02 07:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2da64e1e5b6dfa4acae9b94990edf26b SHA-1: f6de8ba6d550c1692c4418de49b29cf4ffe4495c SHA-256: a2dc32104f106fe949dcac8be54af5d2bf3163a34e9da2c7a6cde1630d921cfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to lead users to phishing sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://nomylo.ru/uplcv?utm_term=ibps+it+officer+books+pdf
    • http://ankamet.com/userfiles/file/merutotilukaxabujureniku.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e3aaecf17---72633208485.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f310beeca---goripupedibabilemenune.pdf
    • http://tantusmarina.com/UserFiles/file/13262724370.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/759c3a3bb55c03cadf8c23f331180289/233567019.pdf
    • http://tipiland.net/upload/file/buluwevuwazakimomamurin.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eff03020c---vofupunufesatuwolisu.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160de02bf86c9d---53846369867.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb7a9d03ca---35962856076.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/pm616rfbl0al51tqu4dr6s87kf/wekurefexijil.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/mjhs1f8jbiq4unu6dbs2es19u8/16682439863.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/fctbui62h4i76qf3pjk9v2ns84/rasojibilas.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b9bc3658a---33376031817.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8638bcd67---58715249525.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d88fc385bd---18025441321.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4elab88tak9knp8iarntolgk2j/vodujodejuzekodebo.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b067cdc95d---11299277781.pdf
    • http://absolutelyneon.com/userfiles/file/jivivemezatanovaredepebo.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8dc090ab---rinetikedipesafunazozit.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d2dffd584e04d869a99575bc46b84c58/65689766659.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a9ed119d9---75103574746.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/b9ae821db1577e2659ff077e4a88fae6/sataziwek.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/24nqoqg9bj3171ckkhkimhat76/lixivixeke.pdf
    • http://aimic.com/userfiles/file/walipotiparaxaworatatum.pdf
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/munarulizif.pdf
    • https://brianhigbielaw.com/UserFiles/file/96036216763.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_off0000ed89.bin
f3135a8e8b28e8da4ed4b65fe47d99bf874651dc1f160177841b9a250bf2c019		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 16852 bytes
font_01_sfnt_off00011955.bin
a221b90a17d705eda2677df487f288e317093879980142bec3cdc3beec0320f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11955 10484 bytes
font_02_sfnt_off0001311a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1311A 16792 bytes

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