Malicious PDF — malware analysis report

Static analysis result for SHA-256 172c987dddfacc7c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 14:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cffb0522a3e77b2e7a9d202507f55749 SHA-1: d3a86a7bfc24a95b08903216f4c31fedb61d864e SHA-256: 172c987dddfacc7cd634ea98a86271fcee49483731b8f568315b7a1ff533047a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing secondary payloads. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458ada8b101---wujosugazibiwedopo.pdf In PDF document text
    • http://flirdining.com/uploads/files/9737181476.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/44745953713.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/xozojubewutagotevowikexa.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/jj1f08895i2i9k9btce6kmt3ae/bamizusupidoziwekaf.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109030246138439.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210909_310FADA4A8F2804D.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145060d0754d---zalejaxazevobidodamine.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/xosetipegad.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-12/20210912201846552842.pdfIn PDF document text
    • https://preciseenergygroup.com/media/fomikev.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/94260881906.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a796395a3e5cf697f4ed9082f841e148/lotewileriwenumitawus.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/dudeziwom.pdfIn PDF document text
    • http://freestyler.cz/img/file/38032348911.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371c2dc8935---10992850342.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/68268195823.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331b30b9370---30670622235.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16317552738cf430867408678d1a5a.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/91242907772.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f9d8035cba40791eebc90e3e1f310d6c/midoj.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/1186091159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+i+save+my+contacts+to+my+phonePDF 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_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 10892 bytes
SHA-256: e8d583e6de11f93199bafc1e7e910c539bc5ee965ec6c151419975432d377305
font_01_sfnt_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 19172 bytes
SHA-256: ba5731bfb704fa6357cf9828b046aaa84001b0585e5d17ea8348c6ed189a44c1
font_02_sfnt_off00012007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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