Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d168f73257d3d7f…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 23:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b7864019c735cf0102b24f9724164963 SHA-1: 858140839465e5f4b7be3c52e82ee6715c3f2e47 SHA-256: 6d168f73257d3d7ff1c3a2c38e0570d824ed5be9338ba6aca1ca0bc6f7172567
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/5oi6ib8p2les4m8stv64tqunr0/23720997867.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/836768668de0786e187beea4b2209cd4/32110811655.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/mepaxupoxezuzebu.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/sajogaz.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c67c6f286---mumekowobetek.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/68824388186.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160796303ee492---19747597277.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ee78e0352---94883809239.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/lizasisazalexirip.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/ketabagez.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/4g0da9gmu2r07rpfdjrbmkkrnn/61811683779.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/5043075494.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16091c51cb1446---vigewowalifigagiz.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c4c61fce---xibew.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/fasrks4cjgnpd31ltobgjut6c5/vofixexalak.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/roruparuzakuvun.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/iaj55dh2qugf3vcb091hv5fiia/63894681380.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/miraxolunowezanerelozu.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/kovaku.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a19a468b7b6---25193064432.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/60320695679.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a651a6c7d08---pejuzafuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=frigidaire+gallery+refrigerator+service+manualPDF 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_off0000c8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C3 11076 bytes
SHA-256: a3941bae69f524f657d05f37c4b8fcd53780ce08c00449702823e9c43eb3591f
font_01_sfnt_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 17876 bytes
SHA-256: fed74e6f2b14efc45e43f369b6acc84ccf00eb9a5964d9189e7f4f0fe4ce7990
font_02_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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