Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4aafa7ad97f77c1…

MALICIOUS

PDF

69.4 KB Created: 2021-09-19 02:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6203b38b8e6e34c3de8701ba9efa59e8 SHA-1: 32b1e360272da134a79d8924856e85a79a47a492 SHA-256: d4aafa7ad97f77c1a1c965e5103be2dec93e04bb2a9f2f2d2ea16aa022e12da5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised websites acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6954

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.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://dongphat.net/upload/files/62670387460.pdf In PDF document text
    • http://schubert-hh.de/image/file/90253686534.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/69306108826.pdfIn PDF document text
    • http://www.siposferenc.hu/html/24810883724.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/77240489135.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/joponofemiribawana.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/lalebugezidiwuduzusimuvep.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/moter.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/mapekepirex.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a3aa71a99---visubosapuzinitipipa.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/jabubikotobima.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/51548700610.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/gupevowejewobiduzaviv.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/67171133022.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/muxovukesipiviwalo.pdfIn PDF document text
    • https://ibextrail.com/editor-images/katemonese.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/zuzerosol.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/12906394813.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/939a243468b544971c545286282fe3a0/kuxarolumaxowukus.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146757b109a1---2115794083.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/15639701897.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/konewamuzuse.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/fe6580c003a456f8697d833524a1e177/nasada.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/sebem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=stick+tennis+unblockedPDF link annotation
    • 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_off0000be3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 15532 bytes
SHA-256: 7d7ba6c4f35cb04a91dbba6e44c2d822dd40ca729f35154ff16c2fecce07e79c
font_02_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 10508 bytes
SHA-256: e441db27e2804a9f958a6213f092d80b13f8db0bb34b0c57dc6369f3e5e03728