Malicious PDF — malware analysis report

Static analysis result for SHA-256 6406f8f9ab372cdf…

MALICIOUS

PDF

90.2 KB Created: 2021-08-11 00:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a6f428939a12665a3242a033b952f46b SHA-1: 192051527adffefb18821d77f5f134df7924570c SHA-256: 6406f8f9ab372cdf06a395dedc0c341f1d2fd0475997011b7d0ff6d954e997d5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various external websites, many of which are hosted on compromised CMS platforms or disposable domains. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/f7423a2760ae13f325b2c51439274260/31743946973.pdf In PDF document text
    • https://traicaygiasi.com/Images_upload/files/redes.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/44795412916.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/19hefg533n713fa6puhl0pous6/43974379852.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/rixebutawa.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f20485df75ce54a8a1ea41bcac5cc6a/27732712311.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/41651883645.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9478471c2c---nikomoxikuwinuja.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/mipenerukiru.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/7296677961.pdfIn PDF document text
    • http://someteme.com/archivos/_20210722203119.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/42043441500.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/volibijinigukumusem.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084df3e23b45.pdfIn PDF document text
    • http://cycling-software.com/files/file/62664004913.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbba851692---62091606752.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/a0bb849b6cab98cdf8d4e79a6176d9a3/japudulatipanunip.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/85137655619.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/defuta.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/a7fd8af60ec99ed06462884d628d2c13/rofuratetakuxexunex.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/donokarijinezut.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qp4ietsgallsdioj3p8j3f4p1b/devetup.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6ed72bf6ebd117b9487232e5f30e3013/88374066267.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610676eb813df---niwabuxatudoranifuwuj.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb59d2e552a---18182723097.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210728_063404.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be279a0ab01---16256308207.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/71697614573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=verbos+terminan+en+s+inglesPDF 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_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 19712 bytes
SHA-256: ee4feba831010ab358e57ad95735c38e2464504c32720c35f93f3b22ad181f00
font_01_sfnt_off000128d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EE 10560 bytes
SHA-256: 0338674924d4f99e5952ab3b49aac1bd6719c75306d1b8c2309c3c13b99664d7

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