Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15ab22d92619246…

MALICIOUS

PDF

98.5 KB Created: 2021-09-02 09:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 23ca381c2873034581875a9216659d3f SHA-1: 856bd255212f5fcd4a1f33b7bc4b6b87be9b60d4 SHA-256: a15ab22d9261924605462753ec0824e083cbd3a0ca231b7874943456955dbe91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely serves as a phishing lure. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of numerous URLs on compromised domains strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3288384ab8---54883920978.pdf In PDF document text
    • http://2ds-creations.fr/userfiles/file/86802237195.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/k0kbltcn6786q7ujda4q053htp/duvosekuwarewofak.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/bozizulugosefiwo.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/57916177474.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f75cce93e---8413604962.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/612e63f81ab24.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/vireri.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/50921274786.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7258e328---lodebevekemomuzegenila.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/gariwuzixuwiri.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160722bacabdfb---75466229514.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/291654144050.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cb40f5dff5d---81185529361.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982c0e7ae23---xajonu.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/vopuj.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/lesutumunenojugiga.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/56972047648.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/12968519531.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4e6d4e72---83213860491.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/rojoda.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/69441074324.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6e7f9d5ad1a36d408578dad2c103516d/doxexudenujotudoxogo.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160797ddbd3eb4---roresesemeleme.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/7d82aca61013b37db100f928394c4288/66863712735.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/f10o1u9d3meos4lleocq4qt9n2/kedixanexetusujofuxato.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/makowusomaxazosuzupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+use+the+nether+starPDF 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_off00011d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13540 10244 bytes
SHA-256: f376ebf3ccbf4dee635325e14ef78193c99a36f7dd5821afd48b3126152504ba
font_02_sfnt_off00014c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C43 18356 bytes
SHA-256: 735a362ba027aef2bcd702f63796b8fc16378c724ccb6fdad4d348760ae6ab97