Malicious PDF — malware analysis report

Static analysis result for SHA-256 945173fdf70b1a38…

MALICIOUS

PDF

77.5 KB Created: 2021-09-18 08:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 52280bc69a76dca5d550790cfe31397e SHA-1: 57267a6c4ccac62e3b2f5aef53fdb3619522595e SHA-256: 945173fdf70b1a3897f3aca42c04e0cffeee778fbc4e3dab818e0e854c5eed96
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall detection pattern strongly suggest it's used as a delivery mechanism for further malicious activity, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 https://garglob.ru/uplcv?utm_term=the+secret+of+secrets+osho+pdf PDF link annotation
    • https://fasleh.net/Files/files/jovedifako.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/91901396497.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac5a9174b---pafosajokagelixabilosaj.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382e0ede2a1---11781576350.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137485e4d67e---mesotajivugo.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/28381257672.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/23480101762.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/nuwiwokaragokom.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/kuwumavodej.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/57034727375.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/mukasimusimuvafesenejeli.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/84751548782.pdfIn PDF document text
    • http://sql110.com/pic/fifapewiwodoxanejipes.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/vapagidoruzu.pdfIn PDF document text
    • http://dalaichau.com/files/pijosalawib.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/tozekeniwaluxuxikemup.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613635c5a30b1---fumigememi.pdfIn PDF document text
    • https://ijpdua.com/contents/files/38098711026.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/pujadot.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/31738953234.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/30631999598.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/mejopivupewowowuverexanu.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/63747788894.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322e5d97692---kefowimozekunifixetug.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/xaxaxufa.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/kavelemezunokolijakexi.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_off0000cb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 17380 bytes
SHA-256: d17fb0c5ca094213fc97d8d3e839a0a6de87ff58e10e70c5425a9f2050983921
font_01_sfnt_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 10276 bytes
SHA-256: 4627e9f4d3d1d60a5ec6de5117c3b0d65781ad867852bf10879919f12b54a7f3
font_02_sfnt_off00011050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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