Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac89479fbd66b8c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 14:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0c2501927a9405b23c9b5e23f2884c8 SHA-1: 230119f8ae2f27191c8d92c947d3b8a89d70f686 SHA-256: aac89479fbd66b8c72673b6d84c7597714a235dc6f0dab1e6f39d7befeffb699
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 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.
  • 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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fde1acb758---boraruvutawutulozevada.pdf In PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/90009856895.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/63601170037.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/ratobupapigifefasaparizi.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/zofimena.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/27606360841.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/41501504654.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/11134151284.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/bb69af4cd66c2579c6bf2d55a9a285e2/xisuzepazurujo.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/67904100893.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/05e9ek1lsiab73rlopcrr4qig2/90139994514.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/87019318613.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/mizitimumin.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/lutomitidupe.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/42872315217.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/23700935723.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387f3328f29---2361738711.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/fapokodusuvanaximawewone.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8a48cd0b320c9d6c774605eb00fa85e0/mefufosiwijewozidufev.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/pewod.pdfIn PDF document text
    • https://svltv.in/userfiles/files/lijuritus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=son+appareil+photo+androidPDF 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_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 19088 bytes
SHA-256: dc96f2c43a50d35619bfa7ceede3cab8db29c95b74c98deecc4db2e7af22462f
font_01_sfnt_off00010899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B0 10396 bytes
SHA-256: 22f358cee58e1297d1c4244fea9ef92ca3392679d83b00a97d5d5db96d503b3b

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