Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ba5fa280ea5ee1…

MALICIOUS

PDF

77.2 KB Created: 2021-07-30 08:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 349843a4ae615cc02cfa3c64f8fb7f25 SHA-1: 1eb4c9c3155f683d8bbd73395b3e555ded936464 SHA-256: 86ba5fa280ea5ee100dead2fe78611fd7c4b9d2993b6bd851c4307179dc55395
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's designed to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://maasmartcity.com/userfiles/file/44989439100.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51f225785---33184997414.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/sesazitusimorodepo.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dc611ee9d---77774821471.pdfIn PDF document text
    • https://hoalavender.net/upload/files/48630928212.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/zugigawelabumemidu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bf396d617---nibewefusitijavarujotel.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/xukidejep.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/60079769210.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abcc71da313---61793489324.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160858ea0c1752---31336449985.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e344d493db9---nogeton.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075547372cce---53661984390.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/falasiwukaxo.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/68468478879.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca015a476d---zunisoregokuni.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/ziborebifujokon.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b3656483a---80867423944.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/38e677be4c524cc6249074f81075e552/motewulazoxepikep.pdfIn PDF document text
    • https://bloc-immo.com/images/29710192929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=paperport+12+serial+numberPDF 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_off0000ccd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 10828 bytes
SHA-256: c0f230f89b236baa40aa7ea3523dca28ae045b1c7416061d3b370096456b00a7
font_01_sfnt_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 16252 bytes
SHA-256: c19973367e94d87e91f18c3aa23ae5a4f4be0b7c1e090a3f309c068207629ecf
font_02_sfnt_off00010fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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