Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd34aadce2aee5ca…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 02:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f905641cf687a96d01169d742fa70ec SHA-1: ecf9dcc233ab3327a4afac1309f67500b26aed19 SHA-256: dd34aadce2aee5ca984f32d9b1666b13df4473bcc9cf2e7082ebabf909157c14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wastran.ru/uplcv?utm_term=sonos+android+trueplay PDF link annotation
    • http://gorisum.net/fckeditor/upload_file/file/25293607442.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/27388524354.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/71601494493.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/78056851641.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/efbfbda4c98ab300c31d4603929417a7/35709567814.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/legikuvoregumemulafakimul.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/nejomawafulozetumafor.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/76829176571.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/repelebekiwijoji.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/jokajikadizozuso.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140e89ea2a30---vezasatow.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/242066413.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7143e825---fetepegizaxekaduwemomutum.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4p1ba0n3m1s5tasjhiqlicmh4h/wesuwinatajebawodizevaso.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/79460131997.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gknobd2mpm5fsslraogkatp3f7/18768719377.pdfIn PDF document text
    • http://samtle.net/ckupload/files/13253491677.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/rexas.pdfIn PDF document text
    • https://datajournonepal.org/files/lovifapofipemejonukuxowek.pdfIn PDF document text
    • http://www.polni.si/Images/files/11843496374.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/74352ab25b2401230fa76fba0b51376a/74479355504.pdfIn PDF document text
    • https://istanajp.net/contents/files/ditonegetivimasa.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2e49af144a4643c40a0ee1826241c835/temegalimas.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_off0000d6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 10676 bytes
SHA-256: 2655a731f97ea78dd4a86598ecdd34c794b27f663fd7b571ff8a6915c24d3ed2
font_02_sfnt_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 17608 bytes
SHA-256: 5283794686c647f8b096fa7f9b03c473e084220eeb6b1da65a2b0194c8711017

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