Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aefe2b6685bfdfa…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 09:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d6fc68db9b9ad828251c6d7d7a848233 SHA-1: b3f14e3d6e98c60a26b1fa51c4e182cb461ff48f SHA-256: 9aefe2b6685bfdfa9d878a1381ac85adacd5f232bdbf2d2e31c06bdac2749b79
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://escritacontabilidade.net/fotos/news/file/dobidofo.pdf In PDF document text
    • http://texinpack.com/uploadfile/file///2021091306011152.pdfIn PDF document text
    • http://billsky.ee/files/file/ruberilakuzerusubunafan.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/52374329753.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/s255qu05o8pdp05m62cd8h2m41/9719259104.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/70860194707.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/33746095749.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/mamuvazulegaligugaradise.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/lipejaduvukurepifaro.pdfIn PDF document text
    • https://fratellifurloni.it/file/60932296455.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eda9ce33b---22789239214.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/64899594164.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/89454399371.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e5fa8eb0---72471019644.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/92039886619.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/72858331363.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/sevapiwigim.pdfIn PDF document text
    • http://dongphat.net/upload/files/22371202891.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/81179267560.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161411445a3129---tedaruj.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140508a77117---vagidirapun.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/31757769824.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/sulalimewixukuruni.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/mamekot.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16141699a12e92---kofumizenatimidokip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=logan+movie+onlinePDF 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_off0000d667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD667 17188 bytes
SHA-256: 963c39cd67cf6df16c5e12eec71dd8ad9ed433960ea37e9d01c8dcfa077bc379
font_01_sfnt_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 10108 bytes
SHA-256: 184cbf8cd87c9664fa88e19698f302b82412844793e6244c482bb0ffa62b5434
font_02_sfnt_off000118d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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