Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d15434fb8d984d…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 15:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: faeae01781ca7bda22dd915f2e35cf22 SHA-1: e405036db67a24f6806324e9e9ec62e0721ed59e SHA-256: 90d15434fb8d984d8de9575f8ae74932bb4749ff03f38f8cd0be61dedb02e769
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://synerhu.ru/uplcv?utm_term=quality+management+system+in+pharma+company+pdf PDF link annotation
    • http://apsons.eu/files/file/motudivotiwelemofopino.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/77362922433.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/3388053293.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021072813432773499.pdfIn PDF document text
    • https://dm288.com/slicice/file/58964393485.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/konubisodetajopar.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/25565589109.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/1925250870.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/70466318026.pdfIn PDF document text
    • http://centronegozi.com/public/jawuxanunedago.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16074dc0b24e96---surezisovud.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/d398d2e3066d494cc95dc688b9c87076/53496100274.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/33935635970.pdfIn PDF document text
    • http://gibisch.com/files/files/maxovisawonuj.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e80aeed5ad0acd00c039ac1a91146937/61448332228.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bc63cd7d8a2---juvizuvotuwi.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/35935716097.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/bojasijaxevefotetilon.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/f7ec077cb9a4d0c76c18bf292beed9cf/xubamofubebatomowig.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3fb98d53411ceb3e7f1f4847205a1516/bogedijokitisenobanuwo.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/67720705825.pdfIn PDF document text
    • http://alcantara.cz/data/file/xelax.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088593d0f142---rujasepemozuj.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9c04bf8946f95fbcbfdfb2567db0dffc/nilaxununugonupexuto.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/mexojujipifofezebo.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o915i1sr4m1ea85vrnudmffknu/naxamisep.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_off0000cc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC03 11340 bytes
SHA-256: 914e264ef5e37567232c0c2f37f71936feb48e767fa8ea13ce56b3a446f57045
font_01_sfnt_off0000e660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE660 15372 bytes
SHA-256: 1e796d58246612c989bb2a70832c1de8fdbae5926e759aed213704db1dd4e60c
font_02_sfnt_off00010d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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