Malicious PDF — malware analysis report

Static analysis result for SHA-256 975ad2f6f17d1215…

MALICIOUS

PDF

96.6 KB Created: 2021-06-28 01:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46b828b9775ee93cdee7c1634dbd95c4 SHA-1: 7e1dbe4fa951736d20ddf7eb86dffd96c4af6028 SHA-256: 975ad2f6f17d12159b3e865b32c205b7ff576ea9015c7927ce27fafb6944fef1
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 installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=exponential+functions+with+radical+bases+assignment
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cb56d8d61---8498382265.pdf
    • http://mega-gold.com/userfiles/files/degomagatuxe.pdf
    • http://sosnovgeo.ru/userfiles/file/92916959819.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160805a0a0d4ab---28874087821.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f0aa427f8---95057926350.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608609483f461---40060931860.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98040660d0---248960711.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7d614e1a---mefitavosunogiwasosudikud.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/e1e9534b38bc8fc7290276302d1a4cfa/39015892933.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075983630a44---7111027136.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9c5e6969f7f67bcaa5f8094478e62b44/71169199692.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e82daf9c4---mimigutexopudolarexusof.pdf
    • http://akinmedikal.com/uploads/file/sigixadoxavugifuser.pdf
    • http://zrdb-drogbud.pl/Upload/file/fanapuxokelaxadezikedufen.pdf
    • http://kasaitogo.com/uploads/files/8280202088.pdf
    • https://bnbcostaverde.it/userfiles/file/zunididifozerozuzegon.pdf
    • http://ezibra.pl/upload//file/41481815805.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/qlo90sslig6t6tegn48lm8q8b4/79511167542.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/4004803f163fa8fd0e26f0bcd2c067bb/41863327602.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/zegovika.pdf
    • http://emmanuelmissionarybaptist.com/clients/74938/File/56689599970.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/oqb43lhnp15ekh4e4hic5t2l51/39007199046.pdf
    • http://alemotta.com/resources/original/file/tilevebovex.pdf
    • http://fertilityupdates.com/userfiles/files/78017701765.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/ratileteguxidi.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb56fd5181---65362078806.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ehrl3vaqhk12dj6fe0v3aktio5/66165566074.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001170d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1170D 16792 bytes
font_01_sfnt_off00012f24.bin
39b9aa07d402b945ef545022088f56bd359226cacad668e61302deedf9be3fc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F24 11476 bytes
font_02_sfnt_off000149b8.bin
cde3b20268ce1bcaa385f4bfcd040e3b56b5a26dd101b94f998a28ac67319428		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149B8 16584 bytes

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