Malicious PDF — malware analysis report

Static analysis result for SHA-256 b354c6ba8f802a75…

MALICIOUS

PDF

88.4 KB Created: 2021-07-08 17:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2bf4ebe430c62a3eb752949029cb7a3d SHA-1: 358bbf3575c2fdfc9747db302c12caa3349771f2 SHA-256: b354c6ba8f802a75d27c04cf9bf3ae42e9d649a67afb3643e9b516874b6ca805
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests an attempt to track user engagement with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=how+to+make+money+mining+cryptocurrency PDF link annotation
    • http://akinmedical.com/uploads/file/morinetino.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/1206ff023532ad8e3fe1e205f59ffc5c/napijatikavivef.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/55442299038.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/78603195321.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f043b23bb---dujegibagepinuzowovusid.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16075a094d2355---9496191104.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///vimodudide.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/65259817450.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0ba066451---zasakukinugegukisopimu.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/10386617832.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/96906210294.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0cc73a6b4---71904477311.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/zogusesexafoki.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/19627606591.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/tasuselikisejekijowiguxe.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082495da0f6d---74775879509.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/93c348e675a6158fa57dbbaf83bddd0c/48414452405.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/mbindqpv54avue9hnv95qf5l9n/71158111232.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd10d92ff4b---bujedukurefat.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e6232a099ca796fb8a57c34e68919e08/25911779183.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/10598615758.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/najuzemarizipasidewunowu.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/kujares.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/19490940202.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/74895572563.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_off0000f553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D65 17308 bytes
SHA-256: d61b94090f4c085de99b22252e08ca0d281ec6ccf7d5116407c3ead19bd1c3a6
font_02_sfnt_off00013aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA9 10888 bytes
SHA-256: f34b1607a591b71d0cdc2952606c0b9251b80499a1df2534a409cc5e7209d40c

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