Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1c670efcfa1346…

MALICIOUS

PDF

87.1 KB Created: 2021-09-03 14:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f5c4830d133f22295ae1dbf0a57f3ce1 SHA-1: 4765438aeabb643ec2694ece6d0c61d06a2b3654 SHA-256: db1c670efcfa13469c2136fad64b3c5d08a341ef1ab78c6ae300e1ea64022381
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an "enable content/editing" lure. 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 0.9942

Heuristics 8

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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 http://ultraljud.nu/bild/files/87519279060.pdf In PDF document text
    • http://snap-drone.com/userfiles/file/2658292568.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/kunitejebibumutisu.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/27744258559.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/72110602106.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f386db866b---nerofitupirefajepuzegela.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160723c5e72435---13860522874.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/8216333097.pdfIn PDF document text
    • https://gozdemsigorta.com/hulya/upload/files/40455521053.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/hg86gmulu6eo0d3ga7nk0nlk28/biganisemugodekejos.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/37713024139.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/feeead23ccc2815d70056ad29a118621/45790276999.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/zazewisutojogegozutil.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/43148656988.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/b900cfba9d9ce00f2a415da3d97cc178/wivusivepapepapufomegi.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/606662933.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/lekefodudetojufeposugidup.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/53822890714.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609843975abd2---xelujutavijanesivibapa.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/36287475791.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/zataluxabomu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607050ffb67da---bukejunupute.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/78940060544.pdfIn PDF document text
    • http://anm-av.de/uploads/files/rilezovujenaxunoxofugut.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/nenadotuvigok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=excel+vba+refresh+active+worksheetPDF 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_off0000ee5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001066d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 18616 bytes
SHA-256: 37c6d9f539239cb8cb171779db010fe9f0b1cb88ed64767f0ceab36926ca239e
font_02_sfnt_off00013685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13685 10796 bytes
SHA-256: 902524d18e51fe54bd98f1c7209f46b32f870a6b97b6540194c70ea96c391b0a

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