Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bcf5e2215ff0e47…

MALICIOUS

PDF

82.8 KB Created: 2021-08-31 20:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe4c4c83363b8b95d1c483776b5a8327 SHA-1: 2c8a7e3c567bdeaf4c1dc810604e9f2966b4f23a SHA-256: 1bcf5e2215ff0e479b06d56a1dbb301fdd04aee2aa339339edd8be8234bf4cbf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/muxakemes.pdf In PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1814f619f8e9efb34eed7f489f8257f2/53128151512.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/ca8bfe3e3dbf97d350a6f53ae484c4f7/wogod.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/jh42dkan33ihpgcj34f8frj2m7/46676229161.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/78b73225649a4a7c89a62b92d8ff4858/55243121616.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/bivixuvisiribinupuwageno.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/26579916213.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16123df8b0bfdd---34052580903.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/14827466673.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a701d13c5---22846483590.pdfIn PDF document text
    • https://angkalaris.com/contents//files/19495742143.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/satokizunom.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/redefukerevafoluvasin.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/3896894022.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f754de9c1---63369778995.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/65005502344.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a2eac66e5---sivibokosidope.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f67fcbf845---nasusef.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/dolijasilodeleni.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/6a1cefe562951e2f196e61f4acdd5970/sekamovuxifare.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160735ff2a8e8e---lebogige.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/gixafewebizeg.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/12313858772.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab214f049e---duritozewomobitapena.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/kawuzaridaje.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/detoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+5th+wave+onlinePDF 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_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 10188 bytes
SHA-256: 3fc3af77d9521debfd1678a08b931ba9ab4c08f7a418e7bc87d6c413af5d0794
font_01_sfnt_off0000f247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 19352 bytes
SHA-256: b3d4cdccd8caabb433a75dbd294091539d1b2239cf920c8893037c2a13c9e962
font_02_sfnt_off00012521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1