Malicious PDF — malware analysis report

Static analysis result for SHA-256 57908f355a4aeea7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 02:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d70cd854b74d7988e6c9d2da04f1c0cb SHA-1: b31e8cb326361c2af4c57e07f061a2d21a0b95ed SHA-256: 57908f355a4aeea73d117788be2e05c1c708294fb3598afbcbced799ca4ff4af
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The malformed stream length heuristic indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://cructi.ru/uplcv?utm_term=hand+of+fate+2+best+cards PDF link annotation
    • https://store-connector.com/_upload_bilder/_filemanager/file/23010896362.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/5of5eb93vvpqvip1qiln82ci94/9550459286.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/sikemob.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0c5bd1341b51793ba8245091400b6341/6815628205.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/lebewunubakuxevanozi.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d5f18c9ff---muloxodexipituzef.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/88573100726.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/famarekuduvagekofamuxibud.pdfIn PDF document text
    • http://186086.com/upload/files/29027766681.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d1da84a95---99553575367.pdfIn PDF document text
    • http://abc-tel.ru/data/File/14963221817.pdfIn PDF document text
    • https://kueapem.com/contents//files/dibikubobibawunix.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c895ed2735---gofiwalaxikivip.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c41e4908b---senajufibogi.pdfIn PDF document text
    • https://bloc-immo.com/images/8783840903.pdfIn PDF document text
    • https://t2sc.me/userfiles/madakosexegutewu.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/42114217276.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/49621918595.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/fe74dd768b1f8a9739bf8accd3e251ad/vupasogezu.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/marunu.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/zuganiridibuv.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/zalorikatugamaxuvufu.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_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 10580 bytes
SHA-256: 2875624958845dbde2b359db723f6d87581cb5be42fe5b88d6a6ce70dc03c882
font_02_sfnt_off0001143e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143E 17248 bytes
SHA-256: 6df74c0253107e7142ca65f13ae242561358ecc6ca7d1e97b420bcc9327d0ac1

Open this report in the interactive analyzer, or submit your own file for analysis.