Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf01f878594690ed…

MALICIOUS

PDF

87.3 KB Created: 2021-07-04 16:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b79b20550859e269bf9b0b30a8758bb SHA-1: 46ab791701d82c85096b2ad7117347449f2501ba SHA-256: bf01f878594690ed39dcb69a6d15f725a9d53f122efebe515144224436ca8d18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to direct users to potentially harmful external content. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=resting+calories+per+day PDF link annotation
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d65d87186---lebepuxov.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5c4bbcfa1---88464517557.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d2589c3cc49bd2fe7cba1e42c1170932/nobasitiwebirodu.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/zasaxukixobuxogu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c90cde0cd3b---90809943450.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4669ef2f8---89454401091.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/67834142892.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/toa7do0paoasn772qusikpponr/1397066336.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kaunmhev4a5u39hr4ni004ngk1/28006846287.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/kp06a7hhqmu1b64hhjfqgvqpe6/42389159699.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/4ajgc2e28ljfsje3p3h8cupckd/21016082864.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/36815274059.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0cb653ac---kalaruzatoraruvixiw.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/71963302986.pdfIn PDF document text
    • https://aneri12.cz/res/file/81588072746.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/jezatigezofozasariv.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ab7bb1fe7---xepepozukave.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/cf0813e34fe412c01cc0ff75d1c28949/xuperut.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/02178842d7f8c3ec420c63ac035b6f46/tusuxolafeninexonozar.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55ea3a5148---30941684325.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/kokisaburu.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/zogisoneduxowenudo.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/16968103891.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/21224587404.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/fbdf2f899fce2ae27c7f9aa10cb91286/53152467867.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_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 10848 bytes
SHA-256: 58b6e088064dcae14a874a9b1ef7ec440b6fea639912dc6e87c27cc6f707c219
font_02_sfnt_off00012306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12306 17360 bytes
SHA-256: 4e3087a238b1ca107702c5dd68bdb7e5f1a268431326646085e7241bb8f8b03c

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