Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d0f7428a2f60bc…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 01:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9bad89133b295271fbfd7ec417a1f54f SHA-1: 7f816c3cf2e2028f46379634cb68ef6df80eeea7 SHA-256: e8d0f7428a2f60bc1d7b1646b5d852c1248299fbfcf5ab168e43a86cf880ea7a
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous links to external sites, many hosted on compromised or disposable domains, suggests it's designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a link farm strategy on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • 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://medbillings.us/lightspeedweb1/file/juvobivedisiviwulu.pdf In PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/40779640916.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/milepuzavuvananowubopekap.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a453303642f---pumurozetatutemuwuxejalor.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b67792010---89046364500.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/24758211919.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/tuwonekixutotat.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0689b1bc96---18774906866.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/82211876182.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/40751025824.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/26911411317.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea70fe310a---wokisopiruzuwizorarak.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///zuzevekofiwi.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/nafatimekopaxixebezake.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/36193147514.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f496facb97e---xibukajabivati.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/41728596671.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/vixerig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff209a18d98---15356731222.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/88379283269.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/d241534b205015ddbc93c81d9f8b15d4/luwukufimeforilesage.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609afbd03666f---lovurerupetibakuj.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/65967454732.pdfIn PDF document text
    • https://funbugs.ie/files/file/18523611859.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/razumevetulegagunufutod.pdfIn PDF document text
    • http://www.seja.lv/assets/ckfinder/core/connector/php/uploads/files/88017152878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=text+over+image+bootstrapPDF 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_off0000c22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 10716 bytes
SHA-256: 636c18a5bba0c4b26ad44428cada7746c7491ef34b1853795685e503e7e00f78
font_02_sfnt_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 17616 bytes
SHA-256: ba80656d1762948804ed0aa023e78d86c77403464bc686e868ed94daa6bc1d21

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