Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8d666898d38f5d…

MALICIOUS

PDF

75.1 KB Created: 2021-09-19 08:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a7aaaffab5498d2e83b13957bf5516ae SHA-1: 85152b706548c9b4e44c374f00f894580bed5f47 SHA-256: 4c8d666898d38f5d2278e2d67ba409a70a9ea99d394a9ebfc7bf4901ede0a8f8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. These links are likely used to lure users into downloading malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://coretry.ru/uplcv?utm_term=amazing+spider+man+2+mod+apk+latest+version PDF link annotation
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c9rt3ttnmj21bng8jj0bm3suj0/depogejubumaku.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/9477636579.pdfIn PDF document text
    • http://midel.me/userfiles/file/85633330165.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pexeluxaxogojiturisaf.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/u532m0cph9bpdn10roj5dn2stb/74014527765.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/6890084721.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/67280209380.pdfIn PDF document text
    • https://windsbs.biz/files/file/miluwu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a9259ab16---91292462005.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/pedebavimi.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210919083708.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/42115922604.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/livaz.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/20424133622.pdfIn PDF document text
    • http://topp.pl/_topp/file/13212632186.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146260706016---70564740506.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/bibasa.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/zitodobad.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210910_A40652A744EB706D.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/jutowagidugifog.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/62194406072.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/dotigafibe.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210911095929_ik882n.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/xinabovadagav.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/61358085042.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/39619480831.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/nenedawugorifeja.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_off0000c2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DF 16356 bytes
SHA-256: 40df34bef41956148a36892783baf847925958f20f23ab98942e96bb1ca1b938
font_01_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 11056 bytes
SHA-256: 5105fda1264265b5e2b9a0b5440cb39472eb85158906234973faaab668a6bd82
font_02_sfnt_off0001063a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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