Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef4d349a5ff92a6…

MALICIOUS

PDF

94.9 KB Created: 2021-09-01 08:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a780d2b45f139151c425b11702959610 SHA-1: 8e93156397a39158ddf64f012732ce112dcbd2bc SHA-256: 1ef4d349a5ff92a6f751aae91544d9b540f9462a1797fbc5194ec00486954ae1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/283b1c3f7f6ecce7e8bcba5b9fb39b9d/lutegox.pdf In PDF document text
    • http://hrdiborice.cz/erucom1/files/files/sozufutawofagomu.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efdef4081cd---53319328834.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/35082951112.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/dgepu19qddbjh9aub9khn7jnt4/15630290144.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/xupifanonuv.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/sc7ii7fl8vgvc4tln2p1sphog4/najevaxudulibupobexa.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ba9c276e268b212358c66f9adccee118/zenubebanekakudufile.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/8829859260.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/03f6ecddcd303c71da1eeb81003988b2/52677201244.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/p839n0kvfvarbea5fj22sjipc7/fivaluguzotusetesujevima.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e05cf33fc---37987293507.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/zajekugoxupoxu.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/xixudimeloro.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/39735223751.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3b6109ad444e942ef96509a6d640f4e3/9721522214.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/lajolewiwakugawolozevos.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/vivulu.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16083e15333c98---88772810291.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/ranezuvipedeg.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/saketelafama.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/pozujezufifopube.pdfIn PDF document text
    • http://roocenter.ru/upload/file/tipudosiwafer.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/41707154145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+many+rap+songs+are+therePDF 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_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 19256 bytes
SHA-256: ab0696a5bcfe180bb656fd9f7a3f21c79a0c16814864cedebe0a14d9a3e3386e
font_02_sfnt_off000154fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154FD 10752 bytes
SHA-256: 434cbcca4cdfee1200c3c584ef06fa3765253bcfa0657494fc1900974e1e6628

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