Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2920c191a6babad…

MALICIOUS

PDF

84.5 KB Created: 2021-07-01 12:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c46902c0b2efcd29d7ed6e39d7d7168d SHA-1: 4ad9d1e2112bae25353292a3b810084854d5aeed SHA-256: f2920c191a6babadd38c7de19d1990806de1f837ba9c5f909766e35440a99bc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content or phish users. The presence of external URIs and link farms on disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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=federal+council+for+aboriginal+advancement PDF link annotation
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f699f3c99c---20649443151.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/67947285174.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/55604942619.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/tcf2vlkdilln1t2m9ie3sjfo00/bugegodalasokogujap.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/xuxofotepudetul.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/92336346067.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/hk9qn7g3ip4b1qsvasun2mlinv/tilejododak.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ieuuikik6d77eq3cjn280tktf6/81822062770.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/51376276506.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d53cd2aa2d8b2cb737ce2e7e69062a84/depujisudujosap.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071c4628bbc2---kulejumiruwiniganixoka.pdfIn PDF document text
    • http://envigest.cz/upload/file/24826306991.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a04149592f0---famonim.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749605a8a11---51999868533.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/s5gsuqd6k0fciid8o4odv64055/17321366400.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0b9e8579f---bokaranuduwedokemogapekex.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bacbd01fa---63122404556.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608124e2b0003---74259019537.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/buvezidapixasaramideweruk.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dbbb885bd---jazadonaxelotepizapal.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/23774116827.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/vugozil.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/j4m73l2bog2lpusnrulaaeln92/boxofubafitasokazanazumex.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/najujuritojenavamuv.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b501dde61e---pativufipab.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/36911479319.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609973182a429---tarenavat.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_off0000e304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 10932 bytes
SHA-256: 91c1572af10396d906a3f831bda448869c1d752590737dfce8ea8d57b24ae665
font_02_sfnt_off0001142a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142A 17640 bytes
SHA-256: d954257914c5c1dbce5127ac11cfdbc7e391a873e8db79cf19028e018f3c1159

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