Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fba6e642fc2faf5…

MALICIOUS

PDF

71.2 KB Created: 2021-09-05 17:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e06098f5af5195027cb0edb51184d5a SHA-1: c7b78dd473ed9f7d14de846a0b791635c249599b SHA-256: 3fba6e642fc2faf568d0b1a5d5459af80c2a94203e99cfc8725887daf9598c77
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure suggest potential exploitation or redirection to malicious JavaScript payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=vortex+tab+60+manual PDF link annotation
    • http://sddshchb.com/userfiles/file/Fl202108210227361678.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/jefowitarekomalatirakig.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/10c5465d8414de93d47829e88ddbdb46/70601329808.pdfIn PDF document text
    • https://rajakedua.com/contents//files/kupofewepud.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3375729d58---34570180469.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/disevazimawa.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc3a555d2a---80297305650.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/kfqoc3jjrjkajf7pit5i841u7k/jurujezipaxotogemiruga.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160928f2676f04---5750684519.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/wokotupinojamivipu.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/lipobavejofuwunexomideta.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/tefaxewunusedufexux.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/zavaliva.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/g8jd3okbt7r66r9fo60ea31st0/fizevute.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcd46bf23f---12330906094.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/68192444169.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ffaca7dd8---56334668759.pdfIn PDF document text
    • https://comfort8889.com/upload/files/jilerulugot.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/pogixunibuj.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/97731510896.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/33976591030.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b5a4ea881a7ff4ee06b5ae4bcf0340a1/kabuzo.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/robomuxegosakirarodor.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/dd8341075a4e6f45261e9d2a574e2581/toxasozalureza.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/lr52460v51lngj45voda7agi53/80202599795.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021081609151778511.pdfIn PDF document text
    • http://nfc.soo.jp/file/pojobegamigerixexefevunu.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_off0000b57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57C 15596 bytes
SHA-256: ea59de10deccafe456a6ae730e8eeb0f71b8f6a75028edbca7718635febc8435
font_01_sfnt_off0000dd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF579 10612 bytes
SHA-256: 58c239735b0e4fd2cd13ff0656cf65f73a8fc014578ae55ebef51e2505a28923

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