Malicious PDF — malware analysis report

Static analysis result for SHA-256 45dde7978e613042…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 19:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 55210b0b8cf68e0052d21a516ccd83ed SHA-1: 4bca67368334d602c9fc318c1a5120f2b31169c6 SHA-256: 45dde7978e61304295edd33a7b96c6f5f2123b6eac36315b17cfe789d1e51fb5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The embedded JavaScript stream and ML classifier further indicate malicious intent. The ClamAV detection confirms this sample is malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=max+video+player+apk PDF link annotation
    • https://trungtammatnamviet.vn/upload/files/pifirofilebezor.pdfIn PDF document text
    • http://18554080.com/userfiles/file/18462818607.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/wegutedukiliv.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/kuxaluvowusiguzupaza.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/zazoxirusilutu.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/09bvg0bd3nad3afphbqepetspc/semadobogane.pdfIn PDF document text
    • http://traviet36.com/upload/files/50087686064.pdfIn PDF document text
    • http://precisao.org/files/files/bamujinimap.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-02/4b45f47cb8639121b47342e50f89e490.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/99239357014.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/kegamoliteda.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/lowedupasafidilogu.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/someratuwofuxerowep.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/saxawotatifura.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210914135433.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/62782641614.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/9e12b3ee7d5dd76a0c2c7b1e94c02125/rabopumolexobawe.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/tonatuvori.pdfIn PDF document text
    • https://anesaportugal.org/upload/file/tefukoxemotuvotumemox.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/majov.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rukixurefexozux.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/43584267984.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/75436458549.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/1a25d52343abf032307e844e92e86eaf/fadugifavizo.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202108312310446850.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/dororowusibonekopiwa.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_off0000d45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45C 10380 bytes
SHA-256: 7f6cc05f9a9e2cf5492dab8e340c9f4a11a465475bb55c301148d4a52fabe66a
font_01_sfnt_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10400 18488 bytes
SHA-256: eb672dc005dc83348afd539ff48e38d5143caa267ef41e0e8a593067f7b7a1a1