Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9764a927bd727cc…

MALICIOUS

PDF

96.4 KB Created: 2021-06-25 19:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88d8b24ba4d4ce95671f7b9866cf4176 SHA-1: c68e902c1ee55d453612d87113314b2fcd2b1ad1 SHA-256: a9764a927bd727ccf7118f2255e83f7a1b4cf078297501bf64f096c369358659
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It functions as a link farm, directing users to various compromised websites, some of which host further PDF files. The primary lure appears to be 'free fire hacked version free download', suggesting a social engineering tactic to trick users into downloading malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/d8qm8rand8d84diqn9dgdfn4e6/10240706164.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/44b65d8f3d895afd1eb6525fbb6aa5c1/xunimuw.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5ccb5ee4f---71321743609.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607207fa59aad---43175196034.pdf
    • http://modellszerviz.hu/userfiles/file/zikaneteredu.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/6023b29287fc7947a1b0c5e57fe8a93a/41678934411.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/krkensgpr6gcm6lp534lafaev7/11481428458.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2118232d10---xixox.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/905e2e36dcd89ab2bc600f5803ac7a29/47731194763.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8a07e2a31---fepavegaletipitewetejoseb.pdf
    • https://soudurelausiere.ca/upload/editor/file/wawugozi.pdf
    • http://www.asslar.de/downloads/3428621022.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/b7e9e9791a01e9f0d049628e615c2257/wuburovukoxejepoko.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/8rsgitvabqthm7d0es9uotgpc9/wafoniwixofodovevalumuxaw.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/jelewenusim.pdf
    • http://reelproductionshd.com/userfiles/file/rujiralonapeto.pdf
    • http://joyearland.com/ckfinder/userfiles/files/87020137558.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/v1kad706ceuj9sf95th6560mi3/21256904439.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e567a2d2---paposuzupekeveva.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/213ed3e74bf0cd2e3cb9ce4d38dc6b5a/vadevebade.pdf
    • https://bepxuyenviet.com/upload/files/vonopefig.pdf
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/61682186947.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/46bda75kn8ndpe9hjupo1mgbp5/65426127716.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=free+fire+hacked+version+free+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 16792 bytes
font_01_sfnt_off0001142c.bin
769c84c2d6a041be9b8fe4719ed4b6e4f23d174730089a7a9e5e105b81d2e81c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1142C 17208 bytes
font_02_sfnt_off00012da9.bin
208aa48fbac9f0c5c80b21a91ac77d75d14d6091d037888d56d277b681847412
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA9 17368 bytes
font_03_sfnt_off00015b19.bin
1132a8d17a97bb85bba192782192997d13428ea47e6ae8a038d1f3fb882aef28
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B19 10696 bytes