Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c5e658443eb193…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 03:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3b59c0e2894f46cbef6a0e5ba2816f2 SHA-1: c665360b450aa4447672108eb0e7f774bb8b0a0e SHA-256: d2c5e658443eb1938331355f306abba4dc81b89877b60592c882f47900de3f2f
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and links to external PDFs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 9

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/dlk6idp2fokmqn58mtqc46uva7/5759263800.pdf In PDF document text
    • http://afro-safari.com/upload/files/zetegikepaka.pdfIn PDF document text
    • https://beautydent.hu/editor_up/437054792.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533939f015---noguvemasakikagareguves.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/zagunokefoletufazuxi.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/janebojininulumuvikeni.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/d5v7at370nps0nf23p4cd2er52/83586485198.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/libozuwi.pdfIn PDF document text
    • http://contextuae.com/resimler/files/15359863390.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/63650449303.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/62335536086.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3847a75d---mofifaxun.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/42046e4c0e9c49a0d015d1d2f2aa37ec/85525805623.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b159d0b3106---niwuxivutepixexan.pdfIn PDF document text
    • http://apcmagon.com/userfiles/mufevetetobezibijom.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/63f859d190ff7e920ecae31e6da1f974/59304502157.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/32589792532.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e6856e884bf---23495018255.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b5b1c84a912fb07a16a13713242b25b4/10540199191.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/36445037685.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/10746826960.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/lasifiwolevibezibiw.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/k4lq3v3p80762j8dtrdcdgivvi/27602064164.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/18623536256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=convert+open+office+writer+to+pdfPDF 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_off0000d46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46C 10420 bytes
SHA-256: 721c9b2dca84a65d4996a867e947d52bbf1ac6f467e7bca15199b00b528f1f10
font_01_sfnt_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001044e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044E 17076 bytes
SHA-256: accbc9c5569cd7fefa13da28755dfca74944374d244dc338cdbce6e605efe754

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