Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3afdbecc1feb044…

MALICIOUS

PDF

96.7 KB Created: 2021-07-06 19:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2ea97f075c96d12fa9beadd08ba95dd4 SHA-1: 2cb2caf365d1de4f7d6653c6fb4c779b10ccbf99 SHA-256: d3afdbecc1feb0449ac7f93abdbf4bd96d6efceee38bc6b1cc5487b6af609c7c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The primary heuristic indicates a link to an algorithmically generated URL, suggesting a phishing or malware distribution attempt. The presence of multiple PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this, indicating the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=next+derby+manager+odds PDF link annotation
    • http://duda-tech.pl/dudatech/upload/file/sareri.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/79767463671.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6b92d633c30bf4bd33099eedc896717f/27064955745.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/95285984741.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/6685979935.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/12339764539.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210602174654909.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5522545589.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/punowo.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/dalob.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a814b15c6ab7c3db37980cc53944f59a/tejuxe.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/hpqs9859eag4antobkhfc52pp5/ligevifewa.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/julifijo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dmaa6rol1oha73p1ftckga6sf2/fatolerolodusu.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/5g2q1e18am3qkuc897r8o5iu23/zavepasalufi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607116f72132e---50244172227.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/josizisep.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/38993454612.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4661516c---rusogudopetaxo.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/68567879317.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d11c76f112---gaxivedezelul.pdfIn PDF document text
    • http://szpk.hu/_user/file/99356598664.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/87058179251.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jdi8q2onm3nfoa09s59ucl1d0o/xunabepewodufosudoxof.pdfIn PDF document text
    • https://comfort8889.com/upload/files/46846118007.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_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2C 10788 bytes
SHA-256: 58ad12c662c1c76ac576a4ed80c4ec72907331f52a9e1f40974ea2658fdd005d
font_02_sfnt_off000145da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DA 18220 bytes
SHA-256: 0aacaaa51477f544c794eacc5592063a805fb5b605fdf10c61b5a1f0e46a1059

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