Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa40e1f9289775e…

MALICIOUS

PDF

72.3 KB Created: 2021-07-02 03:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c9fc004d8c139bd2c5359aa8e719e636 SHA-1: 975ba34354e07585a2c33bce644ff2d625881ff4 SHA-256: 5aa40e1f9289775ef09c4293b42c7c7f340f3014a78fe312b7a74f6411c26ee9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an intent to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=hoover+mach+3.8+manual PDF link annotation
    • https://golf-tout-terrain.com/publish/page/file/xorajupotebuvite.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/nemetevo.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/lenarowiwoxikozix.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/2idh7ds3bmv0qd8r4di0h7rnd6/95424584396.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754ded65123---nowomidi.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/gidisoderenolejo.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/pibosanurosedeked.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c1913b5e2---33845210419.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b61def886c6---4921776814.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609e02bdd0804---delazekol.pdfIn PDF document text
    • http://smithsgame.com/calisma2/files/uploads/24944256276.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/bcf37d5928b1e2988aa33468e7adf2a4/larafofodu.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/vc3h3pmm1tof00a2bf8c0cgemf/darubupajenoxipili.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///202162324945328.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/51434170753.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/31866326762.pdfIn PDF document text
    • https://luminex.pl/upload/file/18839481487.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/3225e8997ca80949d47ed552f0c513cd/gizamolalulumutodixu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/758jsevpeota6oada1enrp9al6/dobax.pdfIn PDF document text
    • http://scpt.it/userfiles/files/dubonedoxaminonogisor.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/90258003951.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/60382342180.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/da3088d89f11c0711b7bc47fe0b757ff/rolugem.pdfIn PDF document text
    • https://digireg.nz/upload/zivuratos.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071a98c7f374---nonubitobetavilaxibaxe.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_off0000ba30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA30 10740 bytes
SHA-256: a84b2c3243860cb3340b7b5375bbb94a27861537f771c48346915d24ce3d8198
font_01_sfnt_off0000d2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B3 16016 bytes
SHA-256: fe64001508a43b718e1c1f78acbe87431c6be3a3c4efd3158306c64ce9974993
font_02_sfnt_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1