Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6829484e61774f…

MALICIOUS

PDF

68.1 KB Created: 2021-09-07 15:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5a349815f73d76a1547cd233c4bad4e8 SHA-1: a540cc7cadb75771fd65adc9eb4ee7cb5fdd3985 SHA-256: 6b6829484e61774fdcb8a930fe025df64e1cb674cfb8fadd3e5759b3b3120c22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to potentially compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7013

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://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a6e61363---junofazi.pdf In PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/79663481030.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/vaxesademezavutakosopoles.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607afd5124813---26969252051.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/28842b03606ed25d7462fb63deaffe68/wiratuxokotatuzoxisezar.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///fefomebovinavamiviriru.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16096d3d19a118---75826418113.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6b0a27da8bf3dc58fa3e16b29449c06b/45835598359.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab75871bc---gazonenufojoxosulazademef.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/88748254240.pdfIn PDF document text
    • http://signauction.net/userfiles/file/90012429914.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/b0soglfrh6kkuvsg8ahb1j9g53/68721444742.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/69111713186.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/25c463e695edae953e3f8968cab99fcb/9219899376.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f21ee9625---rafaxofajowevogiterukesi.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/48724449430.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cec221480f---murimipipiwafekelidexosun.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/93865996453.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/e5b77577edcc6caa60fe362375958297/53878012940.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/37686128098.pdfIn PDF document text
    • http://pk.mo/userfiles/file/noravalil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=thorens+td+150+mkii+manualPDF link annotation
    • 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_off0000b220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB220 15496 bytes
SHA-256: 582e0e61185166506d2b6a3abf29a97c191378f74514c34790c6e9456d8585bf
font_01_sfnt_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 10976 bytes
SHA-256: 205f255bc8af26d5f423c69e58bef0ba55169d6cda5ad9f6db3159232b785781
font_02_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1