Malicious PDF — malware analysis report

Static analysis result for SHA-256 0242012dbcc39c7c…

MALICIOUS

PDF

82.4 KB Created: 2021-06-25 23:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b035ff3b5c10c8b1e88477005ed8eaf SHA-1: 00fec3a907be4968b06bc9b623e9a9dfb8efe429 SHA-256: 0242012dbcc39c7ca032e6e86e7c8d3bddbe140259d41db1b3aeff5a0aa60c04
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a multi-stage redirection or download mechanism designed to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/381d22020740d02d55ef150d118486f4/40622450284.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/87b12a9b5ff1f727ee522266ea8dc2cf/ridirijezisudofe.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5aa18ddb88---fatogomufogodanusobokebip.pdf
    • https://bselink.com/userfiles/file/23223006122.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d180ece48---73199405905.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/frfjousb3us6eh940bujhijtht/jovawurefitobixoje.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8c2a8c7ee---70055913752.pdf
    • https://nadamasristorante.it/file/68037170229.pdf
    • http://ibshop.gr/uploads/_uploads/files/sekabinipafado.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096cdda2f3e6---tafuwerojarajexifapexu.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9294bad9e---saxosodakunexupam.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/85874466324.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cd64cdb668beefb86bfdb057be0862cc/vesun.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/b9bc50959cb38770372e15fbc50e0ddc/pitinogibesowinolapepuli.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/3323c2fd6689478be90fcbaf378e5435/zigavegabowafejisoxorepun.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160728c80b0575---xisumariwebejutag.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abbd044fd75---28199422916.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/df4c1487bc3b759d07fa4c36d70eeb80/fufubabosesinet.pdf
    • http://alltechsro.cz/files/regebuduvazidatas.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607573be9d78d---94273197653.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a65b7c5b661---zejigibabinizugogutiroxob.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb2e71aa67---83603393508.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/772be0a468177a94f4029f105fcbb05f/52741385235.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/77eb937c453065f845d7bad266403c1f/79229023912.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd27f647754---netinulu.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/oghfakno5ppb9gilm0qtrsp6c9/91735939434.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=baby+please+come+home+chords
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddc6.bin
a7518595d28ec0d32d3ac5f5842a7f7d5938f156191d45ef95a597dcc32abb54
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 10792 bytes
font_01_sfnt_off0000f673.bin
74cf326a94cdf943b853594c88a61af9d03aaa83a309a1fe3d513fb2f210cd7d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 17324 bytes
font_02_sfnt_off00012400.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12400 16792 bytes