Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b58b7f568516a7…

MALICIOUS

PDF

85.3 KB Created: 2021-08-16 09:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2e2c6b389540035b1bbcb35358d9c879 SHA-1: 30b321a4d7ea469174cd42d610e22ce009e054fc SHA-256: 55b58b7f568516a7bfbcd29244f24a9ebbb598da06563c3a883ab833eb9b36e7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document's purpose is to trick the user into opening a password-protected archive, likely to bypass security controls. Numerous URLs pointing to compromised CMS uploads and disposable hosting were extracted, indicating a distribution infrastructure for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://pistant.ru/uplcv?utm_term=how+long+does+it+take+to+become+a+dental+assistant+in+florida PDF link annotation
    • http://trans-serwis.com/userfiles/file/sozuz.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094748d15ef4---51323084528.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b79315743b---rutonilibububolijetapeb.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c3d4271c1---24810084165.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/vunbrbeojoe3f30aogt14us68f/jejifumovefagafuxivev.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/ganujit.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/11819795115.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/19821940461.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/78822922881.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kunasobuduzigusef.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1c253c3f7c0cecae6299b99f05d0823a/gunizipitazejujuseg.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/xubup.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/32519143191.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/29790463306.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f6826a9549b8d45150df0cf7bdc601b7/72909183710.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/53030138429.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773a9f0ba95---lejazijemexivakoza.pdfIn PDF document text
    • https://actor-conseil.com/files/file/83936395174.pdfIn PDF document text
    • http://groupkaishan.com/d/files/repegugego.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4e6bda8af0fd8cd1a0bbadddc097751a/suretagodagusax.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079c3bc56b16---jedejiwejuxezi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/q9b3sad0hro7955am8f784s3e7/taxinimiw.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b67704aed4---36285165837.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/92652804819.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/3a5onnrf4mbgenhriop1b4ij5g/90505075166.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efcd6bcad6---44279516060.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ohvd394s4b1rtkvtm8t4ot7uq7/58231369421.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/21486408570.pdfIn PDF document text
    • 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_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 11128 bytes
SHA-256: bd0933a78c8317a1f12103a59c1700bd6466b113e59b135504877314a9fca0de
font_01_sfnt_off000103d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 16236 bytes
SHA-256: 62592c137746f563423d2adc6b62963eeb1c5fec14fb8276fa2f691a257b7d86

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