Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a686fc3c5c02652…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 07:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9bc4d34dd25cfc03159c2f3c5507bd34 SHA-1: bb784f0000b7898c8567564b5d6cde22dbfd3d2b SHA-256: 7a686fc3c5c0265227cb594eee5ee465d053ee1266ec85f328993f3557fcb5e9
124 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV, indicating a phishing or trojan threat. Static analysis revealed it functions as a link farm, directing users to multiple external websites hosted on potentially compromised CMS uploads or disposable domains. The primary attack pattern involves luring users to these sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://archi1919.com/smlclub-files/file/vipunajerevij.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607171fd1343a---posexaravad.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/faa66f6abf197ca8f7b042e60f79e2d1/62096052568.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083c98bc09d9---75942510718.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/solele.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/xikeviwaxako.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4grb6j8g890ccurhmb31tefc16/benifumafe.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/78928551425.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/959e97c7e4e755eb4d54d9421ccc1332/xogirovodipufi.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/92711580582.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/gigakixulo.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92638048100.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/59d3546ffa414c0bb21012ca6f7551c6/41342228523.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe1339b71b---77051067396.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/78327668550.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/nuvijifunaxugadelum.pdfIn PDF document text
    • https://bangkoksolarpower.com/syner_upload/images/files/dajejagegamutawalolotaxol.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zixovukofegasozomid.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/finibujo.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/evg49ptf695sglo1lj10g02trb/5919201649.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/59157226584.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/39526364051.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/63730213264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=strongyloides+stercoralis+en+perros+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 19092 bytes
SHA-256: 4928625b1e706a6355dd006d1cf7fbb657b08a001d60782480b35cc24bcfdc69
font_01_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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