Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df0f9c4c9a79303…

MALICIOUS

PDF

84.1 KB Created: 2021-08-22 03:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 40e913b7456565ccf7d7e9bb739c0d61 SHA-1: a5d0d37c2b13d9f85163b61294b3ba656d7a0e44 SHA-256: 5df0f9c4c9a793038bf155a26da0404c932c69c7368b734be18e29132927484e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://brmhn.com/userfiles/file/20210603142731_a0bcst.pdf In PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/gejerad.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1qac5k7ngradkt5h4vsvbmaajs/besuvedizud.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/50418138438.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/lodanidapavetibotonapov.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/15604532221.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/gefasolumovanarajoxeta.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1b795fbbfeb79258ee51489ed5b196bc/94441311334.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/muvigafo.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/73213053822.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6edac2be0b90e94e1a98879808f1ce11/24424588182.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/58814457955.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/metik.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c69bf2991---86966296225.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d932fad2a11---werazasamexe.pdfIn PDF document text
    • https://sadex.pl/fck/file/91073480926.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/1jvalb451thf9n2p67u9cbnr67/30901750497.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/rabuwebikaxil.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/hd6p2e1udjp40632uj6jefu97v/totujafojawutusogozap.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa22ea9ff---rezixar.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6c7164e4---sularux.pdfIn PDF document text
    • http://chipgene.com/image/files/20210703_002025.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea0c1ec98e---79427826027.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/bamimaxini.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/9c2945f12433ed8cc40aeb17e457b635/joxunutetok.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b82ebc8cc78---mepasigunoras.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gramatica+b+ser+and+estar+answers+page+201PDF 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_off0000e54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54E 16404 bytes
SHA-256: ec2ad18d041780ee5ac5b89fc101938f12fc3a62947e9e2f74eccfc33d883778
font_01_sfnt_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 11252 bytes
SHA-256: ca55b6a797299f34350fda31d59a8dcb6a1e6291427bf5988e741c6c44ab0b83
font_02_sfnt_off000128f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1