Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0f09f0fbbefe1b…

MALICIOUS

PDF

89.2 KB Created: 2021-08-26 06:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9f22ba6ddf524d5b6e3bce5db5df0811 SHA-1: 592b24b8e9cb1faca7634fc8c800dfd5323edf79 SHA-256: 5f0f09f0fbbefe1bdba95390ccd53fbdfcb07a9f29912f752ef6ed7e5bfd9ce4
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=fortnite+apk+any+device PDF link annotation
    • http://nktrading.qa/file/files/rexinite.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/kufipitolasurogobonivi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/wegogamasavufinow.pdfIn PDF document text
    • http://zxsolar.com/d/files/gesatosalu.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/nq57265uugdqui7up544ip6lfo/80174598513.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202108180015345528.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae00c28e21---rejovedujinagafetofizusoj.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/pozadejodogarereb.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f13d06ef6ec---31529832812.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/unadogojogaminekufiba.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/sevuwolenidixilar.pdfIn PDF document text
    • http://apvn.info/userfiles/file/50108603296.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/03b71700f0752824d9d094a01acdc944/bogifugoxorovo.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/82697458719.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081db4e94a31---bitikimanew.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052410321673499.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/0c4c532d5604775be60889bee00e06d3/kesolakiz.pdfIn PDF document text
    • https://x-software.cz/data/file/97002000298.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2a060fe96---keresimakojesedudulur.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/3a0683886e3b5540cc8e9232c6676c44/gazedupeg.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/subarolewuf.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073753d5d616---97935231742.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/luleretivipojobovat.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160818e452777b---ragip.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nq3hfe7umj3bah4r4b66hmf9q7/66432273300.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/29fc671e0880103c9b5296faba285f95/3589029588.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_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 18320 bytes
SHA-256: ad72bdc89b25bb8150da4150552ce273b8d69d9dd5f9137bb7cf1f76fbadbf30
font_01_sfnt_off0001261c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261C 10544 bytes
SHA-256: 0879a55ff1ec35091271d18b466db07fcf086181ab58c1735dec2368c0477833
font_02_sfnt_off00013e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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