Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bdf635c19d51be…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 22:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 28bf67bd51fdea46108f4b9f0956083e SHA-1: 62586b92d154a394fb2d14d0d64d25af9b861807 SHA-256: a2bdf635c19d51be0b9374a57f15a2a9cc3b2e40ff9761c9a41ba5bc1167ac47
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links to external domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_IMAGE_LURE' indicates the document likely presents an image to obscure clickable elements, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pistant.ru/uplcv?utm_term=how+to+get+gmod+for+free+with+multiplayer PDF link annotation
    • https://keongracun.org/contents/files/vasofufolinelosivapaki.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/18826686948.pdfIn PDF document text
    • https://toocapen.com/files/juxujikoremafetose.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/vafilitabago.pdfIn PDF document text
    • http://it-hair.com/userfiles/98419841850.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/38195240002.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/90555607233.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/82600443634.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/35222765469.pdfIn PDF document text
    • http://santehnika34.ru/images/file/bavupegikisapeb.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9f1f29ce---89816851888.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/tt3t7c8l508uot64sci3crrmor/dotoguzamofenetesizuvu.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/62614596391.pdfIn PDF document text
    • http://reopen911.info/media/file/bizosaxuxelepujegip.pdfIn PDF document text
    • http://xprchemical.com/upload/files/32235817541.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/gotobewuropupofedu.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f258d2f6d---vafaronixore.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/03bd04d226954843a7be25ea10632abb/lopurutirofe.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/r25se49gcqmsrv0eahc4vgrmjs/kanemenuxo.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/giseximivevamajugatoxo.pdfIn PDF document text
    • http://bdn10.cz/files/file/17118652284.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/vojerunetaruruzesodivako.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/tokokufo.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8267cbad4---12276350585.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_off0000b311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB311 13812 bytes
SHA-256: 55d8de25e8487e8c010677a95db47d185ae6abc2e615047361c36a062713f8e1
font_01_sfnt_off0000d569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD569 10964 bytes
SHA-256: cfe9b0cc23518671545e5c53199c4ba6ee3e8042caa411b1c34aafc477f1184a
font_02_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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