Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf002460faf20d4c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-24 06:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 12fe12ed41f1c37dce8def77237d2c0b SHA-1: f0563bebb9f06aa2f73738015bca57d902c97346 SHA-256: cf002460faf20d4c934323d6a3ec378a6fbba4f6fdc5f2ac606a185f422411c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting the PDF is part of a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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 https://globalcircle.club/userfiles/file/watelaxisamovivemoxa.pdf In PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/boludun.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/8357877329.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140140669dcc---gedula.pdfIn PDF document text
    • http://apvn.info/userfiles/file/filibo.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/63850257233.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/22466425710.pdfIn PDF document text
    • http://runo34.ru/attachments/file/guwejoriwusujizukoza.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/paweruloxume.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/08daddc4021d0f3da245727f154db094/32913992022.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/boropapigumotenifop.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/fidinovupogilakovesibotav.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/93504168174.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614758e06762c---41879145015.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/47768555236.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/20638451326.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/85800434246.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/89449180567.pdfIn PDF document text
    • http://asqcert.net/files/files/zajuxonaxodafovem.pdfIn PDF document text
    • https://qkon.ca/images/file/pupabimetudijujupaw.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/31959987716.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e318cc403---luwenawesifimu.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/84942102142.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/73203330974.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/raxijor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+security+cam+appPDF 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_off0000da96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA96 17228 bytes
SHA-256: 852693abb0ac250ae146e566eb4bae52ddbd357c03395b9cc4784e21bbdf2094
font_01_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 10824 bytes
SHA-256: e5b80e53aaf836c3fb416e73499227005df11e64cfef3618ac58ee8bceea0026