Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ace645e0039c88…

MALICIOUS

PDF

84.2 KB Created: 2021-07-21 17:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 847e61b90c4a244c2c5b94e7679dc149 SHA-1: 49dca27b90c9d41e3c35dd0fb62dabda7a6d56ff SHA-256: 43ace645e0039c881360631ba11a2094682ae1362eba2f02719febbd101b33d3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm that points to multiple PDF files hosted on compromised WordPress sites and disposable domains. The presence of numerous links and the use of compromised infrastructure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://fitviewer.biz/files/file/27360746208.pdf In PDF document text
    • https://ckmusicdesign.nl/userfiles/file/12100398084.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/38773255425.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/90b40e1af21f7d2e8f9e1fa05872b6ba/38465030079.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a5d630c3e---zagudusoxegoguvafaveture.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/15825817650.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/semabekitefinifitupo.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/94256517243.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609008fc3840b---9061100136.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f7870bdf124000421b84f0b1ba903657/1427622192.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075f997b459c---towepapuledunuwomavu.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/07/13/robavojuwezifigafililonoj.pdfIn PDF document text
    • http://pvvc.cz/files/35258045531.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/xivonobozuvazumateguvuk.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/88950145715.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072a0d18d365---12096542638.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606da12a901f3---gizomodowukolovile.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/fem644agust39jeieuundtcg53/5611055032.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/41k94d2ej889r10f6bpmo97ns5/sikusinagemela.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbedaa2079---bosezutojirugojekiwi.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beed7c31deb---terizidek.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a17d666c99c---momabedixavuzu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b559192c714b61040ab4dab71a7a2b23/44025855682.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1kuqh1qhldvvbjk4budsddjrnh/wilojerejuxuvemoxes.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/xakavezokagazikifosokev.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/d0da890e144eee6eb078389f6c65e0a3/73728599157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=harry+potter+and+hermione+love+storyPDF 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_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 10828 bytes
SHA-256: 4ecc3993a7a19f88fce10292aece45b79b2aec48836d3ebcf8285977eba2c2e4
font_01_sfnt_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001159d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159D 17092 bytes
SHA-256: 27e7f7f56543f40134cc8ef913a79254be5ad9ab4e43bac9cbe303dbf8da63cc