Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac390b1e1fde0a4…

MALICIOUS

PDF

74.0 KB Created: 2021-09-01 03:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4936869d49bdc3c0dea632cb771d437e SHA-1: 0334d7254843a4cdd5d8c3ae08beb906f9f1a53d SHA-256: dac390b1e1fde0a48941c360ab852134aaebff9aad45fe733061d8c7cf8ab10d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The PDF structure and embedded content are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • 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=and+the+god+of+the+mountain+is+still+god+in+the+valley+lyrics PDF link annotation
    • https://cyberbirddog.com/userfiles/files/vafomumaxafawumu.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/wugawu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2255c2d07c52e49bf6c40448a7e219b7/39906826268.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083500c57947---26245023087.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/20602133879.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/rujulowogefuliju.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/333fda9840c6a56c560d897f95cd6fc3/49287619070.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ia258n5f9e3dsqs3tum769sont/tasarukunawokatip.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/bukupiluvifuwanukef.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3oh5t4k806p24lltarbpa7nva6/7320888890.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c869cd1bd35---guruzi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4a5f6ee7d---saxeji.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/tixekuwodufisiwelidi.pdfIn PDF document text
    • https://arerp.kr/data/file///97932757330.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/52689067017.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf29080bcaa---bukararasedux.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/17428850999.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/88457060910.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac22fb74d94---murorewewikexa.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6nfhjtt7pv5o6cnk79jrcpi806/lurativopojuvigetuvixu.pdfIn PDF document text
    • https://schmitz.cz/res/file/rapelaxedak.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/30210549916.pdfIn PDF document text
    • http://asustainable.com/global/file/65265184117.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/kudugiwufuvur.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_off0000bbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC6 11184 bytes
SHA-256: fb4d00ac11af9935ea802ee0ec43f5fdde2b810a6e8dc0590ae94a4c367204c3
font_01_sfnt_off0000d596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD596 17012 bytes
SHA-256: 1852760dac7db046278ac358a497b46b79d914ed4bad1328c50befe4b5803607
font_02_sfnt_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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