Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca9fc71253c1f81…

MALICIOUS

PDF

97.2 KB Created: 2021-09-08 04:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c21714c9764cef5107091538eb179769 SHA-1: a989eeebedca6478250eaebceb44e83d10fb775a SHA-256: eca9fc71253c1f81a69c6717757c163d0d6700f2d2d2342ee67e48a6efc715f6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9637

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://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf869a9d7a---kudilotakutipun.pdf In PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1612a69b083f9d---basemaj.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a894ab6f1---suvetiwifuvivoxusutaw.pdfIn PDF document text
    • http://tradotel-riviera.com/file/nezolajifuguvolatawa.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/a14c8f9b05153951fd36e25bdbb16a7c/moregopokirilekizenobin.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/sekuxibeset.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/40e66c7703237fad9f6351e7601f40da/79767292693.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/febobatojariminiruw.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/9e50a06c3d593496f75fbd151b772f6b/79949974769.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/penanop.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/7fbp19kio3bb3if1vpsegsfehi/gutexetujoxupu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faae42dbad---44034206502.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c757fcba81---soluta.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/65145531931.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/74505134143.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/qonmj568iue7vdgikl6sk0ubi8/658658933.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/laradedutor.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/juwulevisutenubixubonoz.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/74f18f17856ab2dc98dd1f1e590f3296/6819423781.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/4259823509.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609783577cf0f---34082957862.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/499658966.pdfIn PDF document text
    • http://mploa.com/clients/2/2c/2ccb326c3583e393996f575e36ee3974/File/93775414482.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/25987445496.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/12550aa96985f6c2ac4262919cb57a92/94357236321.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/fowuxudiwufegatup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=american+gods+pdf+t%C3%BCrk%C3%A7ePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 3600 bytes
SHA-256: fd6b37e416ec2abb0682a5c2a54ae4de933bb31443a3f8df10eaa8357b907d76
font_01_sfnt_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 21524 bytes
SHA-256: 5079660dfb2b2c564aa42d364edf01f7fa8caf7811869e131d35974a3e991c29
font_03_sfnt_off0001407d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407D 17160 bytes
SHA-256: 0031c3c2ba3b90d97080a977e9401a565477d1436ef4c4b456ff0784fff818bd
font_04_sfnt_off000159f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F8 11380 bytes
SHA-256: f07d726ce83ad7339f1c9a05cd9d897676040236587c4496b4dac9dd3e651f70

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