Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfedce3a82aa486…

MALICIOUS

PDF

98.9 KB Created: 2021-07-04 02:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ffa92d3065b98a7f64b2dbc97f0bfc48 SHA-1: c9c752fd1e86c0d6c43c643658fe73da2e9a8aac SHA-256: 3cfedce3a82aa486deb732986e19e81c360bc79b2fc2fc6d04bc89051befdf9e
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which are hosted on compromised CMS upload storage. The presence of numerous unknown URLs suggests an attempt to distribute or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eot.mn/uploads/userfiles/files/muxod.pdf In PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/63d44d06f7f45606f16ae531917cf6f7/28497185328.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972d5d41b41---didoki.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/54236792906.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1b18ce8d1---jufafenibujamibe.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d87370bfb17847208ea9ed4f88a2c15a/dapukewemigufilegivo.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b50f46d457---wimavixilelapiru.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/72e49a1235f6561477f4e1307f7a4be6/26111424926.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/gomexevadenogofivomijaw.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/lf2aibbkpjd6dvhm9kd5ugtd9d/jomisivizoso.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e106bb30---28331914049.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f5828c9895116b5c439430fdd93752d8/dufomexenumixog.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/patabagepepir.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/jolelotevoniwoxana.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/katovumirim.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/22936544559.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2b06fadcb39eff8b47eb0c7641c567dd/59995823950.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1594f02762bdc1c0c0620096814bb763/40832272976.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/vj3sgegnfldahh6pmdoa2r7m40/49412720224.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfdf5a76c17---94334809288.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/jalavunamogiw.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/72200249831.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///43520898222.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/zefolesuwuvofojunubuxe.pdfIn PDF document text
    • http://synowka.pl/galeria/file/86587037042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=balloon+tower+defense+5+hackedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001198a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198A 10848 bytes
SHA-256: 01a79ed506063b6298b0f96bbb3ef7e3899897ab8a823112de328ab5cc4067f3
font_02_sfnt_off000132b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B6 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off000147f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F7 21044 bytes
SHA-256: 19c5400331fa9c42962570126224cd7c3626456626196f95bf5f63d530600005