Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c3c863d71a9054…

MALICIOUS

PDF

79.0 KB Created: 2021-08-10 00:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fcba48881892ed5973da3fc9fa38b750 SHA-1: 14e0f240f55b7a33eef005e3e1c48572e9bc086a SHA-256: d7c3c863d71a9054f177baa41362fb37ecd09fb14b89c82a3a1a3a4bece74764
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malicious content. The presence of these links indicates an attempt to lure users to potentially harmful sites, likely for phishing or further malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9299

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae574143078---lovofazazavavixozul.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9e1a98beb---87100460389.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607da22056c11---56376912210.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/26684645542.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/68555101082.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dc6b5b05d---49559774149.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803f8fd7e5b---67315489771.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/37977899751.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/22800524339.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/loluxetekeze.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/k7tfhk58lgqkldq3dk0rboag5k/najip.pdfIn PDF document text
    • http://willbramephotography.com/25050932686.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/d87c3117ebfee25bbc6a3d4088ef5363/toxinadun.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/qi6mdntc9vhi1d72ulrg6kpm3f/zibojaguvetipiwejexemi.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/nepavi.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced747cd58---ganibaxapugotarome.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/97564562948435b2536967a21d5754d0/89251259116.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160fde9e616c58---51340307129.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/dugumusaretelulur.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/madebajibovigapedizi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c567b6727d8---nigerumer.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/73089884901.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/0n7njd79rd1cf1uv5457u2vkd2/xelesese.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796e0cee36b---julufegutomosedo.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/ed32b6d44263e26270550391ec793151/60322635247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=kuttywap+hd+video+songs+downloadPDF link annotation
    • 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_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 16236 bytes
SHA-256: bfd853d5b72b39ba88a6756ea6b82c27267f0d8ddc02b12de95e47e699e7374a
font_01_sfnt_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 10928 bytes
SHA-256: 32a8ecd2306f6e3a2e826cb65ea26f9199ffd8d795f6bb4e09ec2ad9c71726fd

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