Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b8755b7999835f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 16:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ad6ea802a1dbce856878c57261a45c93 SHA-1: 08120b5fcc80f6e304cdda033366e9469b86cdf1 SHA-256: 48b8755b7999835f18cd294aed402c713febfd931d143265284f1096fbd06309
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely to host further malicious content or redirect users to phishing sites. The document body is unreadable, but the heuristic firings strongly suggest a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d0759a1d6---zakowasifodonugizibijolo.pdf In PDF document text
    • http://scandirent-new.ru/uploads/assets/file/xuseloborosorop.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/45723778654.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4fa4c9789---29661555533.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/8a4377cd8d7d3fa1459e0b87359c71b3/16881107101.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/40389442333.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/70529165630.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/dasalo.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/38580064476.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/sisega.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202108300044191862.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2119b6334613b7580f3241c7b3afd479/mabisigifulirivivubafajul.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d529c1b6431---58005182522.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/vunabewutebar.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e243aaa1a33---99180800162.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a041ac79a8---zunadoketaroxeguzoloja.pdfIn PDF document text
    • http://houselandia.ru/files/xovufinalakolesoruwibame.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/98016656854.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/vasejizoxaroroperuz.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-07-25/210725072613332272mywl3ebod4ec.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/82092375726.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/eed5a301e595af48272adbf7e6009df4/46891229173.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tamil+girl+baby+names+starting+with+m+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 17460 bytes
SHA-256: ecd5153e1faf43af23b55e7753ac1af351b71ef1834166650b49428341b33b1a
font_01_sfnt_off000109f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001220e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220E 11128 bytes
SHA-256: 98e64947d6a83c0f887fae8ad1caa3934709503c2a3592232b8ca22c8112f625

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