Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7ca16b71f1bc35…

MALICIOUS

PDF

86.4 KB Created: 2021-09-03 08:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ffdacf35d8e8bf96cc689a9c02575d50 SHA-1: a2c5c888d8445236e23c657a2bed7e2a6f16ece1 SHA-256: 4d7ca16b71f1bc35c8805af0758122df546dc0118181a289cf9602c623e0bb0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised or disposable domains. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sure2trips.com/bot/ckfinder/uf/files/35553535232.pdf In PDF document text
    • http://alpha-cp.com/userfiles/file/74729142096.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/d51c7b8bd5d64b1244c6d682ef762c3a/66382827891.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9abb863818---81072060100.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/lefoliru.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/raxevisebu.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747b966a15f---36254470841.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ad124934fa27251cd00d17789e4aae6a/22753078528.pdfIn PDF document text
    • http://aven.su/userfiles/file/71397609625.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7406716c2---tutupasikitufabagezi.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc40043cf19908d883c8d63fbea28a7c/26504298399.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/27977389918.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/37184528806.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/1f575b766e279498506afa243a8b4b3d/batutedidimubox.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/90270052472.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210728_483A4FCE144E8E57.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be8ce6d56---xejebogirudilakesoboxokiw.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/jititapidilulilegut.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/tedimofinaxitokuj.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/84764190466.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c317232e4c---midawodonilobomabosin.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f332a41ae56---28930711967.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130e5fd5e2e2---74263518498.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/49292521502.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/s7e5slcvdg0c8hdnikocq305o5/pefijufijijowokaxonukunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chicago+manual+of+style+footnote+after+punctuationPDF 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_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE5 11172 bytes
SHA-256: 9eeec8cefd3b98bc0bb06044a237eff35f053687c7be5759ba836cb1be0e06d6
font_02_sfnt_off000117ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EA 19892 bytes
SHA-256: c985c27a056d2cc19e33bff0dc7f24bca63864b06217b5eeb54ccb0c37f4021f