Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0373411862cee7…

MALICIOUS

PDF

67.6 KB Created: 2021-09-22 23:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 461d7fcb5048f354baa28c1197a2b480 SHA-1: 54cc97d29b4ed1b6f36bf3bb50e7fc5f2630564a SHA-256: aa0373411862cee7114d9ca9cfb04abfaa78f64832490a8474ea817562ed76e2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and presents as an image-only document with a clickable link, designed to deceive users into downloading further malicious content from compromised CMS uploads and disposable hosting sites. The primary attack vector appears to be social engineering via a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://qcfloor.com/userfiles/file/furabonozedasus.pdf In PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/misumina.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210920_232022.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/8a9f5aa133dba6e54f71751c6718e11f/zevusanezikivoguni.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea1e45e490---77972075042.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/gipuzalakuru.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/tilegefilewa.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/4350132944.pdfIn PDF document text
    • http://aquatherm-graz.at/files/74523770568.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/82862210453.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/26763381684.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/litodelegilazutekilumuk.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/befiselabobipet.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af039b1678---walogexalugogas.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/16990123037.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140e45239b9f---gevexajudufapema.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/84198087048.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/6743282350.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/55395054582.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/85744867097.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/sorujafesemuzibegopafin.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/lilofeferuriguwikipanumi.pdfIn PDF document text
    • http://thegioioto.store/upload/files/vefabiwizuwivigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=lightroom+cc+full+unlockedPDF 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_off0000aecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECF 10744 bytes
SHA-256: 2e3eedc6c325cac468be60ef5e70288811c3f0a7b3bbc46733a7e8fa09a1171f
font_01_sfnt_off0000c717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 13880 bytes
SHA-256: c7dcfa9a0890187aab75d7ebde830a7d73e86877e73789bcc074bf2544981c9d

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