Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c0bc6bf725f3d3…

MALICIOUS

PDF

70.8 KB Created: 2021-10-01 13:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5fd844c1473496c468fd3a890d24991b SHA-1: e1b5c962ca0f1d70a70b94eb78acf6c1fd42f918 SHA-256: f5c0bc6bf725f3d34c2e5b6baaec82f48ee7b68f8ef1b850adb6bd9a4486cae9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=app+para+cambiar+formato+de+video+android PDF link annotation
    • http://abwva.com/uploads/files/15132606961.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/39696717488.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/xasedome.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/28907259174.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/lonedawukisozaxutelolo.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/6506159392.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/74607875998.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/lepomabe.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/puzopuvamevanapa.pdfIn PDF document text
    • http://phfamilyrestaurant.com/uploads/files/vexilenudazamaxapomeselu.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/simenajopuwesidaguropuxuj.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/66620953321.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210901181445.pdfIn PDF document text
    • https://shunnasato.com/kinikejajevo.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210929192653.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/70864044227.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/soseziwajub.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/62322740405.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/5ugbcacfv2f1ipuead0vrabv1u/13620019805.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144c81a84e12---voxajat.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161471f94d3b5d---27581165420.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/68113671593.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/71518463004.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_off0000b287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB287 16568 bytes
SHA-256: 17873b5240e14779150e43ddb9052f0eb3178a0ec24cd3fac4c57120b2940736
font_01_sfnt_off0000dcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F3 10752 bytes
SHA-256: 5fb34a6a13806ecec0228914255634cb262879bb5d72b273abda9a9b4ec34ba4