Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ff04d0d934981e…

MALICIOUS

PDF

79.7 KB Created: 2021-08-01 06:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20a7f1a5fef0ee914644e6d8a464fc28 SHA-1: b3244c82cabda6ef4a6a502af5a99099a21a2d50 SHA-256: 24ff04d0d934981e4ece96de3209db4ce84e86217b3c32aa254fcce88b620fe7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the presence of multiple links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aimic.com/userfiles/file/76812544975.pdf In PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/17727456584.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/23383226852.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/u74h3p32oivbi19p7d6cau5g97/wopiriteguxarivi.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/kukanufobapepovej.pdfIn PDF document text
    • https://studiorampinelli.com/file/wogelirez.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/48ac7888ab503c1125694ffdb6640c09/letopefupepirisek.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d609f50f073---84408796881.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2406a39dcb18fd6f7153dccf41b612fc/dipaletavazomizub.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/aj0fu3qn4kvpbpbahfklhnt357/89110414107.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/97103757961.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3e985c85---54003698884.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a8981fcde03---70055381194.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/lujiwapabosijonufi.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/de1037fbdae726aabccf76422be11ddb/27629169107.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4bc80be6d---91797208181.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/64578222112.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d2fb5ba3b---75342739627.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/38336541979.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b724a0a9a---30962156413.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/uto85sufme9g2hsd7bfl43aqh6/pesarineribakilisu.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/17353520136.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/nisowexomizuvog.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ad3178f04---59848584348.pdfIn PDF document text
    • http://roocenter.ru/upload/file/45069517284.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/kodimilorozefizeg.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb00ff3202---7659340230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=los+5+lenguajes+del+amor+para+solteros+pdf+descargar+gratisPDF 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_off0000cea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA9 11284 bytes
SHA-256: 8e49ef58db1c05698ce267e8a66562dddf170aa4ef41dbbbf03918a255ac33ba
font_01_sfnt_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 18332 bytes
SHA-256: 87e42971e327bc8e0223e1ac79f0ff49b1a75aeb37d6dc2f273f1a5efa069def