Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8aba640418e038…

MALICIOUS

PDF

85.0 KB Created: 2021-09-13 09:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dfb71e87462a39fb6f8455cabd338847 SHA-1: 128ee54942ec116f897e7eb19066735b215db14b SHA-256: 7e8aba640418e038e97634e90c619e72c4ae08ebf8854d5ffc9390d230ce7e30
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of 'utm_term=download' in one URL further supports the lure of downloading potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://cameragiaminh.com/upload/files/besoruwix.pdf In PDF document text
    • http://elturo.ru/img/upload/files/15124319121.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/odujuff1udpsvk05vv08o23tpm/nadefifafelal.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f97f84ccb---wanoza.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/58113156003.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091312483195.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/re60otacgm15pgcbqhk9irvdq4/regexatutudakul.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/didesovovopapijafa.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/takeke.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/gugevadizemevexi.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/31301044129.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/jenamexadokekezik.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/vobepaw.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/gadebivaxabuw.pdfIn PDF document text
    • http://e-sportis.com/images/upload/47511255041.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210902112638.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/5559173814.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/30498265612.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4f73f5e65dfc0f6bd72d77f01390c9a9/lumawifurejitozoribo.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/47697976638.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/80471587146.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/muxunijaw.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/11944171545.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/13423360263.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/xekalipaduzovomuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=download+proton+bus+simulator+mod+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 19184 bytes
SHA-256: 500e707fa72a180c290585ddf8b4f1a5a42454d781a6ed99cc853dabd1b9caf5
font_01_sfnt_off0001158e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA5 10840 bytes
SHA-256: 3048319fb3e874e577c685fe32d57c3156165f228e4a3910288bcee43319860b

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