Malicious PDF — malware analysis report

Static analysis result for SHA-256 932533c4729353cc…

MALICIOUS

PDF

79.9 KB Created: 2021-08-19 18:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4cd5914feb9baa9ccb4cd68e07ee96dc SHA-1: 112677007abe217e0ee14cc7f9527e244be7b459 SHA-256: 932533c4729353cc8d149f8c04ca5ab632fb2e44c9dcb6615cb0c5c04cf97c11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://allytemp.ru/uplcv?utm_term=miller+and+levine+biology+2019+powerpoints PDF link annotation
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d086f4c4790---80976008000.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850a6051269---19237955112.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/0372611d9db75b10aeffc370c264530c/nupunibowakoxivilud.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/39206684967.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/75059334626.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/60797862473.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/b269ae78edf276a4010d65f0d6a166db/lozevesibibu.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/39543278353.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/kepaxusofakamexib.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072020474236---78960249833.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e40130740---baxijorosimi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/uvmkegps0hcc6necn77n9mbb40/texojaxujerer.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161165eef83683---40555831433.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829f9d00d49---60588872346.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/wokafewoxoziwuwuxuj.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/5562480409.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/50615072037.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ca3c552eaca16eb4f696e7aa3d28ebf1/bifujubapufeluxixefawobak.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/66841807687.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9041b0e40f---10060009601.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160978e878804d---81201673451.pdfIn PDF document text
    • https://digireg.es/upload/dunonumawatugudorito.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/79947563478.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/98216440361.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/90afc77b92ed94908440942c74bcdd0f/gunitovozapibadufuselenug.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2591b12b77ea6958c59137a8c36e4dc1/bolinizikozefovovi.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_off0000d392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD392 11428 bytes
SHA-256: 9e77ab16d547384968c6ee08ad493295822771e76f501c7bf71649237e6bc709
font_01_sfnt_off0000ee55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 16404 bytes
SHA-256: 3191f2a4f7b9b2f62bb9fff5ca4e8661213244296d5a660014ec8ca553f426e9
font_02_sfnt_off0001189b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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