Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c1aeccd0b6461d…

MALICIOUS

PDF

84.4 KB Created: 2021-08-23 10:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c994a3095469786834e8d991fd8cef3 SHA-1: eb5c7737fbed59afa4223e74ae3648a73e9e4280 SHA-256: d7c1aeccd0b6461dae7ad4cdce1b54e4b12b08c3bbd2cd79adcf35ef9bf00f07
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics suggests an attempt to redirect the user to a malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://gtshotel.it/images/file/64557000252.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160adbc4b6b1c0---sufogesugadidotoxagaxago.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/manexodakeberanasagokup.pdfIn PDF document text
    • http://nktrading.qa/file/files/jumagedomewit.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eba69f28e2---56281908152.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d7e2070cead771f5ed7f4ffe6cc81c61/67386638600.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/5cpb0q8ii67vqe5m1plkd4or62/81714843091.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/bonaxanowoxexebawu.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/07/63079823946.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84ea33ffcb---93414782822.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/fujogumeluwadibazewowova.pdfIn PDF document text
    • http://geose.ru/userfiles/file/natogulupogiganumej.pdfIn PDF document text
    • https://sitarasign.ir/data/file/wagebotinafegatigijijut.pdfIn PDF document text
    • https://anfauglir.com/images/file/jezuretudowokax.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/risexuwetunogudolova.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/36568103434.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021073014121473499.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/as9gbrf20jiu693mt17vb9ek73/fogesadizaxafetunusatu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095746026a85---rekajoperokopat.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/35d9beaeb302ad63ba3a79b8706c53a9/xekob.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/lomelolilojasiviwefarigo.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095d701e53bb---tixodasiz.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/o8l92b3gl3obltm1cbo8soj2i4/rujasitomexitodovopuwiv.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cdb905f90---76161868132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=charge+off+affect+credit+scorePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 10636 bytes
SHA-256: 075c722262fc519b8bdba4ea6cbdd56ef3c58dbfeb95b93e63c2c4146b2c9db3
font_01_sfnt_off00010067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 17020 bytes
SHA-256: 8ad157dbbb58bd8c3e2dfaca8535f02670461a7013c9618fa3f31fe2493e0d53