Malicious PDF — malware analysis report

Static analysis result for SHA-256 c216b46c90e18e75…

MALICIOUS

PDF

88.5 KB Created: 2021-07-06 22:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd036f09ac37f21a12787fab412979fe SHA-1: 67e9314a86afbf4ef1a497f75ffd27e6a43586d5 SHA-256: c216b46c90e18e75541c650caac60f0563408248f75f48ca589c05da2ae47f4f
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous links pointing to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nscs.org/wp-content/plugins/super-forms/uploads/php/files/0fe68e37c011bc69a86f53fd9af404e8/91759432358.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/69127d0ac491de0afedd2ced3778e211/dutugab.pdf
    • http://akicgiyim.com/userfiles/file/javeruporugasagekak.pdf
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/fovevez.pdf
    • http://j1medical.com/uploaded/file/99075186684.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/163bacc5a1f8bd915153f644e893340e/ropon.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf389e8a10---jitodefabesesowetutiguz.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sv7qtd8b82m19eq1883db35bs0/fejozikupokipefevonave.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/womoxetevi.pdf
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/40139864720.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/126abe5266a16e38a0c302404e346527/29509271410.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906aacc0268---lawedetuwilonoku.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/spjfjphi84bn8un4hm56e7lnr4/zugewugodovebobefujines.pdf
    • http://linkingpeople.info/userfiles/file/simufuxasabilonama.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/makinurataraxuwutofeda.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608681a1cc442---12222910751.pdf
    • https://hasekei.jp/userfiles/file/19010684213.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b4d659babe4d8ced68a82f17995f5a5d/ruparib.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958e4e25ede---nebarot.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/5c028f660647d4ebe3aec59bcc4f8cf4/xozegu.pdf
    • http://agriturismocorteerbatici.it/userfiles/files/liniwevuwubivuv.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607198d68d1f0---43138759135.pdf
    • https://beatmuellerfoto.ch/userfiles/files/39009291977.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=from+jinnah+to+zia
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa03.bin
7752ca1bfb449a5d502e0df331a1ea72621e5942d6d242b382cc921093d06a4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 16984 bytes
font_01_sfnt_off00012662.bin
cda49dcbcb03e00698c0f1de1c1e7869adf2d891de959a6c9835cd742996ec0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12662 10192 bytes
font_02_sfnt_off00013cec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEC 16792 bytes