Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ecf3ad7e629618…

MALICIOUS

PDF

86.2 KB Created: 2021-09-13 02:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd028760866353b2cfc384720fce75a4 SHA-1: 135437f17082b790253f1a35f9371517b2c1b50e SHA-256: 99ecf3ad7e629618bdaf13fabfb2c49785c9bfb89c2fe1bed2132032ea75a08d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crysiq.ru/uplcv?utm_term=avatar+season+3+full+episodes PDF link annotation
    • http://autowagon.it/userfiles/files/76711457316.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/vodusanox.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109121916507128.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/gajowaxuwulibugazijewan.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/2864882496.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ccm2bu54rj4r0ct3fe0drrt2c1/nedosezisajubugogub.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/89505190684.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/piwokekum.pdfIn PDF document text
    • http://japhina.com/upload/file/zejikiburulawamipusilo.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090221491573499.pdfIn PDF document text
    • https://quizai.com/uploads/files/noxafudeleboduzubakuba.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/jutijevawulopidawul.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/jurebesatox.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/30358589804.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a87de7705e---98293831197.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/12770307918.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/66190757748.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161337e967e6dc---53510896876.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/defevotakefipufufanodivap.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/xuribajizivexisobofok.pdfIn PDF document text
    • http://coolscape.info/images/files/93686867232.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/96246642520.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109091933391001.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f739279d3---60251700997.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_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 18100 bytes
SHA-256: 00846cd4c98a022d8bbd5f24a4d64b6f06805a168f71524887dc3fc6952d723b
font_02_sfnt_off000131e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E7 10812 bytes
SHA-256: 901c11311e8c1c409a5a0d117d99fbf51fb459d07218923078cccb7949a0bace

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