Malicious PDF — malware analysis report

Static analysis result for SHA-256 49dd1eda359c81fc…

MALICIOUS

PDF

159.5 KB Created: 2021-06-29 20:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 200b300628faa5a0934d6222d9f114b1 SHA-1: eab3d29bd105df68b582005f47fb3c4cc380c559 SHA-256: 49dd1eda359c81fc6deaaab645847206f89adea7ffd627988adefabd34335b93
156 Risk Score

Malware Insights

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

The PDF 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 potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://pistant.ru/uplcv?utm_term=origin+of+the+word+education PDF link annotation
    • http://velo.hu/UserFiles//file/mupif.pdfIn PDF document text
    • http://willbramephotography.com/34994148184.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/68963572510.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/gofetipomabaked.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c56770c29394a8fa5e94434eefee7742/bulujisobugufa.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///77231921248.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160871b0ae07e3---geberawagutetixo.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607895ee755e6---renovupovejosafunime.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2b42569f4cb3f774ab08e9277a408c29/7501758871.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d62596d5fa---ruvizuwaselamoparap.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/eiub2q8n2092bqviijatl0tga5/3037892927.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c855bf734fe---89485407108.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160959cf261013---lotogovinefotaxozujifosi.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/73426526303.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/77053798375.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6ec337214af19e5e07e179080795a62/92130437937.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/nadukodolujupir.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc698bedb8---32418547072.pdfIn PDF document text
    • http://coumert.com/images/file/menumevojubafadizev.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/903aq7mhsmn6huaokf1cpqg5sidcd81r/jigonigalo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a9afc7d01---wologomagisor.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/47500410064.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba483eeee9c---22381438242.pdfIn PDF document text
    • https://dietacud.eu/upload/file/15059565690.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_off00020d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D86 10752 bytes
SHA-256: 9ab3a064a51890f744e591dfd5e4382b0b11ef5b79e21b284b66406f3f482ea6
font_01_sfnt_off00022611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23E23 19824 bytes
SHA-256: a3232ed6396f96075b8a16fbb08b83e4160213bdd7b97cf95f8428777dc791e4

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