Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c64a58ce7158c15…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 17:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4755030b5ff38dfc441ed1d8f7f858b5 SHA-1: 452f51b65f9ea756a887fa7319bcf93ee97be08c SHA-256: 9c64a58ce7158c153780cc9dc38016aee096d60a660134a85f19ce29c4a642e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability for client execution. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to lure users into downloading further malware or engaging in phishing activities. The presence of multiple PDF link farm heuristics reinforces 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 http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/38119664022.pdf In PDF document text
    • https://pernambucoimortal.com/imagens/files/53499386491.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/1af4dd5afa7cd7e65c396f34e6f8497e/95357888965.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/7309651437.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/60596763667.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/masanax.pdfIn PDF document text
    • https://megalight.lv/uploads/files/46434485627.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/jonejuvox.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/cbb07256f54414a3049a0913e6ef6d47/gasatuwejasumuzizasovori.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/25435694995.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133558e47991---18832056898.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/dagilosigagum.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/77a960fdb230140459db38524117b4d0/28219395819.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/11228776579.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/vowenikoletalixarigux.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/18077417289.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1632126519.pdfIn PDF document text
    • http://101balkon.ru/upload/files/mekarib.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/jejisamudopazuvasurunen.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/60123652631.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/roxeligibizonunakidopixik.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/85021627817.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/ferogujelirapamamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=excel+apk+download+for+windows+7PDF 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_off0000dac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 10828 bytes
SHA-256: 74b16e13262fe7b5e675b7b33c5ac7a4c87e8f4582b2d53775f6b3321b817d72
font_02_sfnt_off00010c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C13 16484 bytes
SHA-256: c6f12ae59a51c3a2a3911f09888f28878bb23bfada60b03bfd7b589a5adeea77

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