Malicious PDF — malware analysis report

Static analysis result for SHA-256 756fd5c761397061…

MALICIOUS

PDF

76.1 KB Created: 2021-09-15 11:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82703ee07c3f0806e1bfb0bf1f2f7194 SHA-1: 5e29759c59fcec18c66414a550f0934b6b5dee1c SHA-256: 756fd5c7613970617b73966948339f576b71c971e21348053139b71cf7e0c224
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics point to the document being a link farm hosted on compromised or disposable domains, designed to redirect users to other malicious PDFs. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://xanbiente.de/userfiles/file/wagutelabagezokakoxi.pdf In PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/3060245522.pdfIn PDF document text
    • https://tch.lu/files/files/tiziwodi.pdfIn PDF document text
    • http://gibisch.org/files/files/68592045634.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/47795115951.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161368036be37b---98790767842.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/17200838373.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141742b48329---554964175.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/53821258579.pdfIn PDF document text
    • https://argumentua.com/i/file/kemenomuxi.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/webodexuvodavifamivakaf.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161413ca78d0fe---49604502147.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109072004065516.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/81487330745.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/20415141473.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354ef5edced---balaxanimofipigixinadovos.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/tinepaxexitesejonif.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/tozuzifanufezitoralavuvo.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210911_115036.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c42502c9d7---losawedibebajo.pdfIn PDF document text
    • https://emenu.hu/editor_up/46595316223.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/16064394645.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/gubudebapufefepijogi.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/narujipib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=changing+hotmail+passwordPDF 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_off0000c617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC617 16832 bytes
SHA-256: 230d2f71bea914798bf7b99655e35dda30865f15c863a96565bd4a43f17b145c
font_01_sfnt_off0000f21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 10824 bytes
SHA-256: d9b0e1318c10e02704d25b391ebdf29101a81848c05748df411aecd436b34caf

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