Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9c719f8904c13a…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 16:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2bd0cb7498f3f06c16d9226535d0ff1 SHA-1: 55d4cc9f3878e04a223de5c5fbe35eedbaa6436b SHA-256: 1c9c719f8904c13a9bdd5561f3837cc2ea28eeca75955d7170590a187ffd5cd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://stcc-sa.com/motakamel/Ups/files/86851577070.pdf In PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160addaf501b4a---jexulatejamofokisivolafi.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079936b5fbc2---suwosugobiluwulefelomi.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/nipidagetogoze.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210718_8C460C778ACF121B.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/10038386351.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/panawodigatulixifu.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/8ed578bb5f11fcfcf5b291f0152c6041/metuzudazuvafofu.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/76498404346.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/domorozidovizuxu.pdfIn PDF document text
    • https://proxus.nl/file/29750663387.pdfIn PDF document text
    • http://davisnewfoundlandfamilyreunion.com/clients/60627/File/janavidiguwowu.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/82548940781.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/zemudixogi.pdfIn PDF document text
    • http://amesonsofallen.org/clients/53156/File/nojele.pdfIn PDF document text
    • http://sentai.cc/data/file/20210816_150354_278.pdfIn PDF document text
    • https://computerzone.pk/file/92153713829.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/roxilavipo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df74dc974cc---kazemugabige.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/gaxejoribojizubefulolerek.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/65692998340.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611ebe1bb2538---89180161528.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/rug3aidelucc1eakvm4a4q4ij2/bozowileduxu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/bda3de240c2f220a3163637d4f98c71f/60626961686.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/sasetixiwirozulapulito.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/70663367252.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pscom5l85usadf6iml7o0sgfr0/19394541057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=unbeatable+mind+pdf+downloadPDF 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_off0000bf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF27 10624 bytes
SHA-256: d38fafa83d79de59f25463ae3719c4cef5e64ee02210043dc0dc697c4be496f3
font_01_sfnt_off0000d733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD733 16456 bytes
SHA-256: bc18b050a878798f7bd55675befaeb1785bf0aa504ea46108664c968d79fc615
font_02_sfnt_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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