Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c0ae5b07fdc8e2…

MALICIOUS

PDF

75.8 KB Created: 2021-09-02 10:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 442e361c157e134b9c90da6c84a4f67d SHA-1: 610f35b1b71afa0e5af7ebdb75a31755324a8ec9 SHA-256: 34c0ae5b07fdc8e2e9d83401fbb61ccc3d98ea5ed26410586b67a8e52426fd75
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://garglob.ru/uplcv?utm_term=strong+compress+pdf+online PDF link annotation
    • http://sochisushi.nl/survey/userfiles/files/34432282721.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/15684753326.pdfIn PDF document text
    • http://e-hematologica.com/users//file/33197392296.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/dcd976d7043b9b4f341eb01d4a52b447/49671055613.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9dd68a050---46691599524.pdfIn PDF document text
    • https://namlongadc.com/uploads/news/files/28577319452.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c592a8e008a63ddb0e8c3f3bee48d7bc/nogusamobeputu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba269ca0f58---39627039808.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ce832cd6d890343aa809e2835192a1e7/25795042180.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/wivekofinukas.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/sorafumor.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/65373900979.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/mitujaxukotuvomonava.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c216268c5---jesikudaxesanifiwu.pdfIn PDF document text
    • https://inncredel.com/uploads/bumutuwolavozonewupupun.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56e5c821d---verapu.pdfIn PDF document text
    • http://esistore.com/userfiles/file/82198294399.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/givagadijuvepuzas.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160de44c66c17b---88533321363.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/lepusenasuxuzowikipeze.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/bulalosololizofojetaxum.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-4/20210604084801837075.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_off0000c4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 10876 bytes
SHA-256: e3bf8f50860d493831cc9f0610c9a8d54a049482c6acdecfcdb2d4d812763ad3
font_02_sfnt_off0000f597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 16836 bytes
SHA-256: cbd24533e1ad034970fdadb2b1c821883f040825806b5fdc57688bc64c50cdb3

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