Malicious PDF — malware analysis report

Static analysis result for SHA-256 911d6ff83bef87a3…

MALICIOUS

PDF

84.7 KB Created: 2021-09-08 01:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7cf41233160e9e08113c46e90cc11947 SHA-1: 39f9d0cfb69708a4849838075228f839d0cf3e02 SHA-256: 911d6ff83bef87a386a8fdee3f41c1785e728935b4572ef62d5a8c5c0b252f8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or other domains that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The file's structure and URL distribution suggest it's designed to evade simple analysis by spreading links across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://philabc.ru/uplcv?utm_term=traditional+patrimonialism+and+modern+neopatrimonialism+pdf PDF link annotation
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087717060afd---nogudibejirelurixa.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/10413198065.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/32122269712.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9da593dc7---50957690454.pdfIn PDF document text
    • https://anaksemut.com/contents//files/fopelofifomojepam.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e61874389---zubareragubitamejidizifi.pdfIn PDF document text
    • http://teplospectr.ru/images/files/zefitovevofekonadisem.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acb4d5b5595---34736556645.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3a7e5c23ce23ade0d333eb2dfb87ea8d/82574850768.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2728c4d4f1875a531b20a05be4306086/vijifu.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/72597857299.pdfIn PDF document text
    • http://sushibelovo.ru/files/vupidodojusurodalubut.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/12212860640.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/2cc48f19d80001628802bbba4f0a113d/76429661314.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087146c8c3fd---vewid.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a087b05a02---38263210600.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/29474098135.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/29024554323.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109080630227663.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8004e4fc61---93697021776.pdfIn PDF document text
    • http://webbuilders.com/files/file/60246995794.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/kirumix.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/materolitigugipupefu.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/41308077228.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/26838015853.pdfIn PDF document text
    • 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_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 10624 bytes
SHA-256: 9bb5728610f685beb61bebb0d57abd86da5a3ed15726a13f76349b1e6ffff420
font_01_sfnt_off0000fbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 18848 bytes
SHA-256: 2607defd59f3124755db15497424ce1e282acba1921129bec6669b6df9a284e8
font_02_sfnt_off00012cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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