Malicious PDF — malware analysis report

Static analysis result for SHA-256 19497a881ce54710…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 00:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 832923f1eb878a61ab75f5a4bc97951b SHA-1: 1d7f28f1176ba672819ee6e3707627b76f467db2 SHA-256: 19497a881ce5471025214328e7a7c09080d13e0530baf8bb8fc33d4b03557f52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The document body was unreadable, but the presence of many external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://e-park.es/img/uploads/files/18213796127.pdf
    • https://alev.az/userfiles/file/68760279976.pdf
    • http://guojingmall.com/userfiles/file///66735727354.pdf
    • https://wcfkenzi.com/ckfinder/userfiles/files/lofuwatimiwe.pdf
    • http://fratellilongoni.com/userfiles/files/pufoluwezego.pdf
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/vupagatumegad.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ac9bc03809d8df89f9d14a9546639e90/fezivegoxiputal.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad93fba3aa---gowapotexutirojafa.pdf
    • https://vico-real-estate.com/ckfinder/userfiles/files/29282595169.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/t1uehhc84fvkj8nsfeibor9g14/kefuduvivivevu.pdf
    • http://gamebonda.com/ckupload/files/musalotonumutiponopunerob.pdf
    • http://randoquad72.fr/userfiles/file/74188338742.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161436c64e2535---gefidorag.pdf
    • http://studiotecnicolamanna.com/userfiles/files/53561193254.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405a6aae414---kenuva.pdf
    • http://xn--h1aeekk.xn--p1ai/files/file/79267719495.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5365ca88e---95922485149.pdf
    • http://geodeslaboratori.eu/userfiles/files/kogakejatudonesosag.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1fac756cd---90026897948.pdf
    • http://scsytech.com/upload/files/gitejewigozeton.pdf
    • http://pusheng168.com/uploadfiles/20210918195554.pdf
    • http://law885995.com/upload/fckimages/file/76375603305.pdf
    • http://vanillasky-ch.com/images/files/49679158750.pdf
    • http://levotst.com/uploads/files/ropisilil.pdf
    • https://yourdentist.ro/app/webroot/files/userfiles/files/neriwadokifapuvanot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=wmv+file+on+android
    • 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_off0000b05b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB05B 16792 bytes
font_01_sfnt_off0000c872.bin
643c786570edb12704afe33a145bad88bcca6ff3ce7cff25c7dd0163eaedac83
pdf-font-stream PDF embedded font (sfnt) at offset 0xC872 10308 bytes
font_02_sfnt_off0000df91.bin
01da233e05eaef07e7be347d5b45d38ea3bbc601adb36eaa9dde13c44dc22986
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 15332 bytes