Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c7bae51d1f6bb6…

MALICIOUS

PDF

76.0 KB Created: 2021-09-09 04:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d0db6b6e6f3a69b42715911ceabcf42e SHA-1: 381f09a62b5ea2ddf1d83e7f03476616bedf1780 SHA-256: 62c7bae51d1f6bb689e4087c4895bb8ece975e348b2ea4b5572ca53674d919cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm, with some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=dating+my+daughter+apk+android PDF link annotation
    • http://aybar-gallery.com/userfiles/files/gulogipitolumi.pdfIn PDF document text
    • https://epiphanych.com/images/file/75748292154.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/36495238869.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/82675939908.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/jubuvosepixip.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/42296878382.pdfIn PDF document text
    • http://indemo.pl/Image/files/fenewikowajapitel.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612edcd75bd87---54449520022.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/49903589035.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/1837471961.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/bidasagopek.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/nh1cccugrq3gbf3kmg9vvpsjgs/jusivudujinus.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/7800765466.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/kufubufobokeviran.pdfIn PDF document text
    • http://qdjshg.com/files/file/gubixegozimamomewo.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/364432074.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/79582605602.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/m5v16s2l4h3eanh044hokh43lg/zinibapurubakumadereja.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/gejuromumalin.pdfIn PDF document text
    • http://vucert.vn/uploads/files/puzetujugi.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/buvoladatisu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ecaaa1273---jukekobupaxebevalodib.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/463ebf5e5c86209a213fe9aef0892a8d/koraxadamivo.pdfIn PDF document text
    • 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_off0000bc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC93 10932 bytes
SHA-256: f248ed592ead1bf2c4aa0780eb9a42e1cbc8a50cf4b6ebcabdbc4a60007cb56d
font_01_sfnt_off0000d581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 19996 bytes
SHA-256: e634ee75f98ac287f2ff7c88f014b92c2901ae9b6017f64605e0b4f184e452f1
font_02_sfnt_off00010a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1