Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae04e182c83b0a3…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 14:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc05981a1cd37d2753f65b178cc0a22f SHA-1: dedb500f20320883950777c1892d96267b921bc1 SHA-256: dae04e182c83b0a3926bb7250b1595c75d89af24410b96057989359d430ec40d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the PDF structure point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/532aa74797948a5d3f106fcfe340d952/34568465043.pdf In PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7bc5b0f66---94801836464.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094df159f3c1---97890290093.pdfIn PDF document text
    • https://claudiodituri.it/uploads/zetasogixaja.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/47741741145.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/60980545848.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/wopiteraz.pdfIn PDF document text
    • http://elitvorota.ru/f/file/topilewibasov.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/sobelilogigudesuziwuxet.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/boruxelizunobilegojan.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/kosopomololotijulepomif.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/jobanewul.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021070800514827.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/fofopigenudidamimeb.pdfIn PDF document text
    • https://digireg.gr/upload/mupodix.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/sejuniputawonukivudaxa.pdfIn PDF document text
    • https://ottopianos.nl/files/74257581213.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/86ln9bf56cc3f84i4vdua8ihgj/pawipuzigowusofowul.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210530_3AAA3BC34249BBC1.pdfIn PDF document text
    • http://fitviewer.info/files/file/nigutusajekudusofos.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/0a38ec5b4bfdc3f5a958ebb847ed65db/mezomemezegigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ford+transit+custom+price+list+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_off0000c085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89C 10860 bytes
SHA-256: 5e22cc9b2a72f357225c1e0954e5cf61d5ff63d646044a88f226a1488de4ff0f
font_02_sfnt_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 17500 bytes
SHA-256: 195cfa9258c3d7eb510259cd8d1670843850ca778bd5aabb692b1e0229bd6751