Malicious PDF — malware analysis report

Static analysis result for SHA-256 a479351d24af4376…

MALICIOUS

PDF

81.5 KB Created: 2021-07-19 07:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a9222ca3a93980df5733d7ecf038fb71 SHA-1: 84ac1e33db762dac528c49fa2b06265628efea42 SHA-256: a479351d24af4376d93623ff4ee63379ad2d2051feb9c3a0150f1a92af699676
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links form a link farm, a common tactic for distributing phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763e093f146---87197383944.pdf In PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd47b3ca7---lakoloraxukipijegavasafu.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/nipasapiweg.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/wogamesujugodibokete.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/4ha3fel9j5559iv8dnitj4fj4j/11224316772.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/lb7l3r92gmva33hoar1p9mn83a/sasow.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/dalerizoxebidowibijax.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3005925faf---84836478344.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/gelagosisizunexolo.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/smp0jvbqg65c61klern54vnoi3/72667777150.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/vitugepodaruja.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/35584166246.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/kilinifinezixuxoz.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/61848760159.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/9596536641.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a6f643d8---gijitolivipuduvatosumav.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/ponolixaribefu.pdfIn PDF document text
    • https://cooperspick.com/files/94281605177.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/cc981c9a974f4b7b135f9237796bfaa6/torivupejubosotarob.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/vuwetofumezemif.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfeef43b540---wovezatetajil.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/puwomewu.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/pegoxoruwolevuvenatotaso.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/jidejewufitumaw.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/67493674820.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e491be15d88---12115751193.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/bdvqhtrgrdaas22i6jq5m5brd6/81832836410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=meters+per+second+to+miles+per+hourPDF link annotation
    • 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_off0000dca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 10708 bytes
SHA-256: 7788a3f692907936bf706205bc047264ee1a4743488301f3d8db9323dcea6c37
font_02_sfnt_off00010d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 16628 bytes
SHA-256: 9c6d198bb33fdc0323cbab5fda3e8f6433793840d390322dcd8de192cc1d3fd0