Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0f1861ed838525…

MALICIOUS

PDF

151.7 KB Created: 2021-07-24 22:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd4d5ad99a8e31b02045593cc4035296 SHA-1: 8d3e42c8dbacac927b37cfb655b40b1b3a9854c7 SHA-256: 7f0f1861ed8385251686bdf5ef653ae770b638e367d801ea782eededd2d4ca09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the detection names imply a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d6262c1b045---tevumalevizukivu.pdf In PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16080bc825fbee---vuzexamefebukozuwesozixa.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/ziforuloxoxipe.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f21044e5fea---38075619970.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/xumatovizonatakaroveza.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/ruladisasogekitikumutatug.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc020dc978---nifobo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4ae7103a1---8178323177.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/badewusugozolamenewiret.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b48ddeef6f10827fe8334e99a8bd8608/zikesepemuwezeb.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e233663ce---sudibolufadugig.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/20260530356.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/69079395908.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/14721012565.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4b7e2a0b08f8453d4297733537e4aae3/71023267234.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df6c803566---demonoturiromisevewap.pdfIn PDF document text
    • https://dm288.com/slicice/file/piwetanexepozebizevem.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/37d700a2809b23a14ec14be405b39cd3/31195880698.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4c0b76261---wirazefaluxudadidoru.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1074f2168d---kasejuwoteso.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/f58cb4513d3381a63982fd4ad1b402a7/83314732200.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16083498f749a5---15634639665.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/7392f4b8fe528d6671a9176c82e0bfd3/furogasaxapavizide.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0569cae2eabc9bb4c820a4a487d2154a/34906840094.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/melid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+importance+of+hypothesis+testing+in+statisticsPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDAA 10988 bytes
SHA-256: 596f607db3ed120ca9009bfe6b8e021a9699bae3b443626350f9efaa20d849ed
font_01_sfnt_off0001f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F712 20296 bytes
SHA-256: 000f6bdc1049e239c671172f88f9e70d96c352711166134dfc8c87c2ae785512
font_02_sfnt_off00022cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22CF7 1784 bytes
SHA-256: a25ae14bfed91104d31f0409d96a4beaa4d1856ca69946a8d97caf008e405b49
font_03_sfnt_off0002355b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2355B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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