Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00c51fa81f274cf…

MALICIOUS

PDF

95.4 KB Created: 2021-09-06 01:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2bda28d625888802ecbfc004a4e224dc SHA-1: a8fc072ebc42591f6a8a4d2232506f77afb9bd3a SHA-256: f00c51fa81f274cf85c2cd48a408258d0b247acfc8d51b5d246e85a2cb7b1f1c
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external resources, many hosted on compromised WordPress sites. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's content likely attempts to trick users into revealing sensitive information such as recovery phrases or private keys. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=ccnp+security+firewall+book+pdf PDF link annotation
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/grh6j6ink6ch3pibentcjpvh29/rolizakibamuzago.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/winunumoketopexe.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/5d9ac4e7b078799c68f9249081d401b2/34428852944.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/8ba29952f0f1b0b81b7c7e045f3fcba0/terewa.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/44915903862.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fa76933e74---24283766738.pdfIn PDF document text
    • https://eetravel.net/file/36099006680.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/3371675535.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16216973138411.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/2645151858.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/32273722800.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/071221328543.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116a5f9d530e---pipuvelidumawapisipexak.pdfIn PDF document text
    • http://labonscafe.com/userfiles/zopewuvufusujogubilu.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ljgevnjfekd1kanh0bb3nv0487/furegojarotab.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/suledarifepuwutizan.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/10687437545.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/71371659770.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/16275529032.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/35822278763.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaff11a8226---41084308433.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16126f5069bfe7---wagadorigutesifev.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/eea722a2867dc98105dddd201780471f/79974397463.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/nelorijapatur.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_off00010da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B8 18748 bytes
SHA-256: 7cea6cfd9cbb4e8d41f3bbb2c0fbf164c78270a1d56e68585e97f0b6fec46f00
font_02_sfnt_off00015566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15566 11176 bytes
SHA-256: 95568b50c5190db610cd91d51ef80993b7cbbf5b85839dc13a2a9f8a96b38ab6

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