Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b6a82ab838e5be…

MALICIOUS

PDF

73.5 KB Created: 2021-09-11 19:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1fa4f886c8df392a262eb0c18b39c7db SHA-1: 1cb667350b2c7ca6c4432d1528e9d0a96a90f4ec SHA-256: f2b6a82ab838e5be189c3d29a992cfddf36785d57232e4b8daebfc2795eca5e3
196 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and a payment redirection lure, suggesting it's designed to trick users into providing sensitive financial information or visiting malicious sites. The presence of multiple external URIs and the ML classifier's high confidence score support this assessment. Although no scripts were extracted, the document's structure and embedded links point towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://cafesca.info/ckfinder/userfiles/files/xogufivasewuxafajas.pdf In PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613948337034d---14827821193.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/15920802435.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/95237123291.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/896078656.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/bekidejakujupone.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2785f1dd971e1311de6e112e805ad51b/jusebapu.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613a937387006---rigowizotosokonuna.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/dizefelomesilumuzasafigim.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/10638029398.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/murun.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/vukoxabikakefitunozikev.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/96847511880.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/45119444269.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/pojabejamitiwapok.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/61847291620.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/17598848386.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/femadugigijula.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/milotutawoluto.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/81706207783.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/22507226132.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/64289605917.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/49593101825.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/88607023865.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/devapakesu.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/werozisexufedatuvorexem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fake+bank+app+apkPDF 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_off0000bfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDE 9828 bytes
SHA-256: d46cd8ad2bb64607956136c292cae153830d9a6dfbd5024738ea8415f1031a5f
font_01_sfnt_off0000d54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 16580 bytes
SHA-256: 1efbad34ac805ea581d77515d31e2cfdb7e109fab6f3e329453b3aa6e97efa92