Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa59083498f84fb6…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 06:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 33cd64651dd0d17ed0fc6983c1ab7001 SHA-1: 4c6e5d3a574e2a8f189c150715329a27e77f3b8a SHA-256: aa59083498f84fb624df4a74cd2b3211f90342955f8e837aa6c0c3f9b03b116a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 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://drafthe.ru/uplcv?utm_term=fizika+8+pegi+pdf PDF link annotation
    • http://chretkinia.pl/userfiles/file/89885480939.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e84d4f57ee8---912408288.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/xarexovuxej.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/pidag.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a014dc54083---mikaxadokala.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/pizojamunamaxazutam.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/vagovaboxurolivikunozuwaz.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/14499358476.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/3679168982.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/guninumitipova.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c69026a56---66264122810.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080338d709ab---32031350893.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ppr8pjjup4pacqomktggsniqg6/dezogixom.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/kokotunibowesumo.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/rjtu19a46i0kqgmci68sfqjgi6/vunotevutupadojijuz.pdfIn PDF document text
    • http://bakefruit.com/uploads//files/202108031719208282.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077abc3541d0---61728839144.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160758273b5792---69490688047.pdfIn PDF document text
    • https://e-room.co/userfiles/file/davodubo.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/73977814033.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be530fc7b86---67685539900.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/23479098775.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/nixoj.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_off0000d4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FB 10372 bytes
SHA-256: 2aafe60bef4f96d5e7d13c9ed487a81e63f73d9c9bf91b0623f8eb26a9c0cc75
font_01_sfnt_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 19132 bytes
SHA-256: 9faf5c3d7a2c3d7e7ffc35532aa8fdc7f6207cca7f04f3b976d32e3d925db185

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