Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f637cf5ba1ee5a…

MALICIOUS

PDF

77.3 KB Created: 2021-09-01 13:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5606797901892dcba992ddd2d1dd367e SHA-1: f900432cc93ee630c33168c9b9e97f2b3b290ec2 SHA-256: 43f637cf5ba1ee5ace18821e2f1675ac701ae722318eadde72f4e945a6789896
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting. These links are likely intended to redirect users to malicious sites for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://sportgalaktik.sk/userfiles/file/fomox.pdf In PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16096adaf14566---ladigerolo.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/03ce3888cb4ecc6f8a89d089f2f1642e/17844558852.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096751a38202---linebefexesitifid.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a0c85a3bc---15392167432.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/miwamufusobimawosojifugop.pdfIn PDF document text
    • http://ligneus.hu/upload/file/jezikevimojogobarit.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/gepejo.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/979fd74c5b7fa780fc48f874a9c33876/16436363524.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/nonomikizobenolumefupevek.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/42605618916.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fbc2d966b---tusonalujibexodosumasafu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf769b5ac23---faraxojavejemif.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/33604071610.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/36811081440.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/regamavizakezazekovi.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/57199836375.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3ab79b4b1---zukezawaluwejijuwalev.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-6/20210806024732915886.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c119a46038---sotapatesimasag.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/clftnimdtvh46iuf934jbs3212/8958872413.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/wuzube.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5bcdcc180---52236413489.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/1769b158ko0pjild4k2c89f0s2/moguripux.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/55435524376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=car+electrical+componentsPDF 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_off0000cc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC32 10564 bytes
SHA-256: 3fbe66af741b5dd90cdfc4fd5c2d99399a3557db3c01c519302962e6c78b8d85
font_01_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 16780 bytes
SHA-256: 3e394316a3eef32632c85b4f5ff63cd0e7314b9ba16e246376a4eb8ebb2131f9