Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c9a91b49faa4dd…

MALICIOUS

PDF

98.0 KB Created: 2021-08-02 20:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7414442a3352e9d736a74b45db33d705 SHA-1: 8511bdb0aa54a17557a25e3f67cb4a71965bec40 SHA-256: 03c9a91b49faa4ddbdc87da2e433f7fa2df454ca2c545634abd07708ebe0cb90
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute further payloads or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/7710kd50b4gibd45tf7j76qrg4/77932791788.pdf In PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/e0f0fcdb921e15696dcb667ca21a008f/worutorifefomuvitibixu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/8f39e319e23c218ed5c7bbb99f3a18df/sidoninivodadoxo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe10c15264---86368335754.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e175846b9cd---xuruvopumosuleta.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/80e5f0fb75f8a52508be4c9310111fd2/jutudex.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb771347e30---40633769661.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ace8265ded5---jukubaf.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/zavosejukopevibiron.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/kodajisafomunosive.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb226cb763---99599574165.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/vu8p55ouqkg6rfpbcjg3l02sm6/36234183899.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/rgdlimdec6j2tlm00rgpcult2m/62285979486.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/xusorasibokawatamafofan.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/84latg92125mhuoa6slplevvd6/73235583077.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/gusatepasokidoxomamuj.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gulokugeminafakoge.pdfIn PDF document text
    • http://gabortech.comadmin/file/kowelul.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a060a9a73a35969cdcb745b43e48299c/35284894767.pdfIn PDF document text
    • https://virker-ikke.dk/files/momazafe.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/29667322646.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/zukarumi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d873889e6de---junuloz.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/dafosox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=john+tukey+exploratory+data+analysis+pdf+downloadPDF 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_off0000ff73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 18268 bytes
SHA-256: 70f92d7c85ca2fb21b5d5492a6af4c7ad3a3bf25d6eacf6e72f15885d4933732
font_01_sfnt_off00012f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8E 16496 bytes
SHA-256: 36ab8ee6ceb95a0a7747728201e51323a72fe0eaa0ab4e943b81dec5307a26f4
font_02_sfnt_off00014602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E19 11080 bytes
SHA-256: 0aa084fb0bbc9b6225fc1368a4d93ae203d21b7449f27243b73b250072d3c6ae

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