Malicious PDF — malware analysis report

Static analysis result for SHA-256 99af71be344e4998…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 00:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 274a98fa8b3c719ec8056315618e3538 SHA-1: c69b2ed5467bc9854739e77fb5d9a0141a33459b SHA-256: 99af71be344e4998d44c50a9f59c4cc2395ea9d9a0daeb73bb841a4a2c55f361
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also assigned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=infected+baby+cord PDF link annotation
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/40447582484.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/62161089007.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160846ffdcb95f---60772996050.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d27937de1---rotoxofujorametat.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/xafolikuxiru.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/kerukimirali.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/xidufasaxiki.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090b377d40f6---wosevegelag.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/gunosaxoxa.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/18328169972.pdfIn PDF document text
    • https://electroagro.es/pub/files/94546395507.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/dorilodivuwuxumomenudawu.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/lorenojetonedib.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607054e4bd800---26256495027.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/96819492855.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/627112411.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fc8357c36---xexokugodupigap.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/zelawofemiwufiwududodulol.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/12563313752.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/piwudilo.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/q31bu6u44gf9fgcnj2gastl1f7/venuda.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/7389231941.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/vozesutodefom.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/xabov.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_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 10368 bytes
SHA-256: f7bac2b594dcfb9c320067f7c430086828b1ab90ea3a266cc9e2104c2c3fcf40
font_01_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001122a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122A 17532 bytes
SHA-256: 4214adebe6986def33ec376c6ab43dc02478b23a0cf030c82fbd7c3bc65ffb30

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