Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9dca310ff879a8f…

MALICIOUS

PDF

74.0 KB Created: 2021-09-17 05:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9eb032f34e00c6c8570d0c3391dc6d3 SHA-1: 61315fa36a507fa21c06df3e91fcf445ffffe804 SHA-256: c9dca310ff879a8f90aa9c1e2ba9e95d4545b764b937006938a0ef0fd7ed5160
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing or trojan activity. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, forming a link farm. One URL, 'https://irlanc.ru/uplcv?utm_term=bloons+monkey+city+hacked+apk', suggests a lure related to game hacking, likely a phishing attempt to steal credentials or deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=bloons+monkey+city+hacked+apk PDF link annotation
    • http://mai-colle.jp/userfiles/file/segamofegowedudakadave.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/83653532048.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/pozubejumopiwalezoguvuf.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/wosinukafazarejazaraxotot.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/28679672256.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/24392057296.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613969e77597a---rixidowomufes.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/momezunido.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/vizutipoliruxelekaweti.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311313da75c---87046560667.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/fipiwirevopodegolosuti.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/71367969919.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/4779c9c0aebbf32166a4125ce1968906/51850292381.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a9f491d604661ecc5954a608a00d0601/49523936541.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ke3q37he1j84jl8sb4bhadhcqi/mukuzinuvikelediwerem.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/66361042951.pdfIn PDF document text
    • https://rajakedua.com/contents/files/nizuzuduwarikuneli.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/91720504143.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/minunosoguwogagodeti.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/85260381705.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/73678945541.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/57369957858.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/96658875912.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/vozuloz.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_off0000bfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB5 16092 bytes
SHA-256: 9e896b5aa78b0981d3c5e05278e2844b5c24bcc7b823c0b7fd91504c7618019e
font_01_sfnt_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 10940 bytes
SHA-256: 4b0e1af778a00f5df64189e60eab152bac73f94d2e580b50fa90afec918d918b
font_02_sfnt_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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