Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22ea2a4ed91149c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-07 15:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9842d17d54b4300b814c68e7e5ce46e7 SHA-1: 3dda3b6b5676cd41ce2ffeee633f23a24f0d6635 SHA-256: e22ea2a4ed91149cd038a181458339033fe1adc92fdccbea1d19abf558bcff60
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic of using disposable hosting for a large number of links, often associated with SEO poisoning or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=canalys+smart+speaker+pdf PDF link annotation
    • http://frezerovka.by/images/fxeditor/file/tewipowozijajepowapiruriz.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/49179507128.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/fc50469492521928873b095f85d298a3/83874296350.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f8e99bce0---96180652359.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/82063946066.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/paxutufalobad.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/94877241399.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/tvkl2920d2tfmhaq5b19kf6lra/givoxeminamuk.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/90672226306.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210806080723.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160abf922a8913---78811933885.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/1odikkj1735ljsvfdfc57o6tlc/74275424358.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/69493209331.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba49efdc9cd---xoxikeworu.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/u7ls6622jedv14q2a2bn2qab31/85102974801.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126b29dbb119---dekafis.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/hk3qa1pibt8e6rbkpp2sg0v167/52214469702.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5501759783---32463639200.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c231959098b---tasulewemikuviga.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/rujusunugotu.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/pewupug.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/tizojebuvoge.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/lorijezow.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078537f40733---losug.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_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 17688 bytes
SHA-256: f89b9eced0417558f0b04ed275011203a6b0fcfaf62b6766818df73ab38f3f12
font_01_sfnt_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001314a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314A 10684 bytes
SHA-256: 87c89e509ef0a4781c335696c0d330ee2eb7b550f017849ee59812e982cae476

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