Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92c48f57914aed5…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 20:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 693cc084c0296ac85d2f5ebe73cafb39 SHA-1: 90f8c0796f2525bffdfc204bac64461e83cdd9c4 SHA-256: d92c48f57914aed58165f26cc17eeddbaffec1193b5785ecfeaa319815a2f57a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The presence of a 'Download' button lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=solution+manual+abstract+algebra+fraleigh+7th+edition+pdf+download PDF link annotation
    • https://behbehaniprojects.com/uploads/files/kofenotugajuriledasedor.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/68996170186.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/worubibulozuxisaj.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/2484801102.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/sexesenubamozugijilat.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/sipotonawatikalanug.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/junugivavasaka.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/gakoxizasozojekutu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614174a0a8af6---fuxebovemeresoxugegavod.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335c62a0cef---livupikojag.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/wexidonekusiduzotu.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/rutefavilemowizevolirike.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/39442483303.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/tidoxenotago.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/konawu.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/87530024223.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/68258157958.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/tixujobunagovesan.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/nuvusozigamixitotafat.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/tafezaxex.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/67030325867.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/75789155243.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/nufedediwilaninepinuva.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/siginutefosemibigazunek.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/s23rt34e2b371879fl3114j8t1/zulosanupimanaladokovanib.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_off0000c3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 16508 bytes
SHA-256: 7499ca034f9f59eb86506259d1b6219ca0f4a66c7bf76bd2bd26b577b09279bf
font_02_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 11516 bytes
SHA-256: 6345e19bb4f3993543d137bfbd30506530f4482ec6f9ea2947f03c0f2d47d90d

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