Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac003b10bde78aaa…

MALICIOUS

PDF

85.1 KB Created: 2021-07-28 01:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d457b8a8af6b797fac99bac92863ddc SHA-1: f613a332c088dfab8a53dc444e2952f8b783ab96 SHA-256: ac003b10bde78aaa7bd188e0a7cb56e36104530bfe80348138d4eb6a85e3fba9
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised websites, likely to host malicious files or phishing content. Heuristics indicate the PDF is designed to exploit vulnerabilities or lure users to malicious content, with ClamAV and ML classifiers confirming its malicious nature. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/d7a2facf2deea5ac9cc79df3f554ca59/56242923947.pdf In PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/tenitijixumajobejita.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/12445830426.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f47dbd7cda59369757a1b5bc4cc5a73b/17316307429.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/653c22103aef0040d51cd4ddf026d45e/zurilifemate.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/poronifisugetuvem.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/jivifufa.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/cnh6inj5vqupvpv44jsm3lofug/54646068091.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/9854160386.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/uauuj9318ivkvi46hvguugku70/38147678310.pdfIn PDF document text
    • http://www.toptehnik.si/images/85199043347.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/70123350481.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/rilekisutatolajidi.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/06ce13b137886d9643a02c883b6a3985/gepewege.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/02b65ec2f707a403233cef0f4e68516e/daxukij.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084b9d43d941---sokini.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/18940359181.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4b9200db3---20226535064.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/23892937139.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/94832736577.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c10b951d---77309966703.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/76307056054.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7743948ffb---musasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=arithmetic+series+questions+and+answers+pdfPDF 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_off0000e8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 11152 bytes
SHA-256: 554427a5925e9dbbe1c47894eec086d8dfbc7a7c14785ea0ce8080a78f31d1ab
font_01_sfnt_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 16684 bytes
SHA-256: 1f6b289fa57f64671878be29d235fc62db167c3eeb7794ab3df9eb857275e19e