Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d33dcba0ad2eb2…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 14:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2fae6cf20b0858d021f948e0d351d1b2 SHA-1: e5835013589f667afcd68a03d56e24d31bb46361 SHA-256: 62d33dcba0ad2eb22924f754d61d6553308d7934b34a616ed85624c949915397
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics point to the document functioning as a link farm, with URLs hosted on compromised CMS uploads and disposable domains. The presence of these links suggests an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://a-guskov.ru/uploads/files/saparogitelanipewenazu.pdf In PDF document text
    • http://pharmorgsyn.com/upload/files/78282193169.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/xixevumekof.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd286ad2b0---zigolimolifu.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138a68f85854---botexubegu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161393cf95b1ec---fukam.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/wematotenudemurepof.pdfIn PDF document text
    • https://loctra.net/userfiles/file/dadinijojine.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/nunubekide.pdfIn PDF document text
    • https://camelcarpet.org/d/files/23740236749.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/22549645927.pdfIn PDF document text
    • http://finchamauto.com/pics/talupedawuxajozifelazug.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff28058fd1---risekonuxavasuz.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/relixililujosa.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/zexofadaxevar.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/zufogixa.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/64524224280.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/kutox.pdfIn PDF document text
    • http://come2menorca.com/images/file/dejorabaxevufedawuv.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/tuwupirotopezel.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/12342418631.pdfIn PDF document text
    • http://contextuae.com/resimler/files/29056092146.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/xupavafibafi.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210902_224417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sample+qr+code+pngPDF 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_off0000e34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 10720 bytes
SHA-256: 81f6378c0bf5a44b407cc01b5e03371129ee8e13fb0ec3ca909664da7651dcb9
font_02_sfnt_off00011366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11366 17832 bytes
SHA-256: eef36fda9df55bdd10793f6b5aba7898bb87bc7a8c528e9f1f50bdcde2a4f4a9

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