Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64175c864ab2f23…

MALICIOUS

PDF

77.1 KB Created: 2021-09-03 09:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8de9678df31ca0c531253ccf1c4c5f9c SHA-1: 242ef5deb0882c4a9db9e452e4e956dcc4e8d291 SHA-256: e64175c864ab2f2355e25b4569aaf767ad08ca692d48c9b3f2312f0def12fb8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://www.serwkom.pl/plugins/ckfinder/userfiles/files/42242946431.pdf In PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa25a9de06f---90395004301.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/popoxivorenov.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/41259366380.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6277a6ca70---dujeretaribufa.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/55160039349.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/95442763242.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/gasatewanos.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c44a7e7e3---27152212009.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/63758902369.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/jelijezekomudu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zadinijaxivezakatal.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/60666476520.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/libokubofepikapasiri.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/35255156971.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7d619d104---xarukojiturogemerivo.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/surepoxeremojuzubedu.pdfIn PDF document text
    • http://lagrupacio.cat/file/majom.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/841ed692be05ee2453e6a005dab0c63b/23628960649.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/6cce14d6eda1d77b775b0a12a1d7da84/melege.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3d20bd2f858fce959ab5bf935616ca8d/zurozunesakiwetidubejat.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/c481g8tdt86hpclimqp5e27li3/rovejoborigojog.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/detumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=garmin+dash+cam+66w+manualPDF 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_off0000c861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC861 17764 bytes
SHA-256: 21c97be41bb9c3399238a275668012357825fc1781c1987da1a988e352f7b5c2
font_01_sfnt_off0000f6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 10680 bytes
SHA-256: ceaba7d831571a614e69093e928303ad5909f437b10403bdca7b61666ef1763b
font_02_sfnt_off00010ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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