Malicious PDF — malware analysis report

Static analysis result for SHA-256 628d0c1faf4202e7…

MALICIOUS

PDF

101.5 KB Created: 2021-09-06 18:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 148b382f0f3a4a59d34551cbddb9921c SHA-1: ee13bcfb66cd6292f868857fe212652b8da2e113 SHA-256: 628d0c1faf4202e759ea6a50313e454f033e40261d4824af083b0c7f1576c59f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest a potential for further malicious activity, possibly involving JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://dadesigning.com/daduserfiles/files/42441469013.pdf In PDF document text
    • http://haozuowenwang.com/imagefiles/file/fexunimixutepadutesa.pdfIn PDF document text
    • https://blokhol.com/upload/files/nunat.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/nurujatulis.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609387c4bdd65---bizamowazerapos.pdfIn PDF document text
    • http://wittzumstegfamilyreunion.com/clients/e/e5/e56c03c63d8c9260b12fda9e5e6a3df6/File/fuvasajozus.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/d48781c1131a3360a70f5890b1e4b590/99127400078.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ea2c59ec---gamexujavetopabe.pdfIn PDF document text
    • https://majubesar.org/contents/files/19765697623.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d3f602fc0---gexijimelebamesarej.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bea3f3536c8---66966159776.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/lajezuzonukimegakano.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074223123deb---jewulikijixurek.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a6d069f05---lejef.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/75286620248.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/98457058243.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/10973183348.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/sonekonogeva.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/k2n17fbti17iftignk7c5g20us/35475128333.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff5e15b7d---wolosakezumefimafenofu.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/74516203846.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/10546266812.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/rararadubun.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/465d95d60bd88abeb59ee109986e6f64/21420181009.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/muxerewekovaxevagurox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=larousse+da+cerveja+pdf+download+gratisPDF 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_off00011eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CE 11132 bytes
SHA-256: 6d4a4346e4b2b9e0a0f5985676e623d0ce96754296ba8fc79e3ac9c6905ca18c
font_02_sfnt_off000150c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C0 20828 bytes
SHA-256: 4d6552ab784a3a555f69bef96d3e7902291114c4cca159a22a5561d37b4b0ace

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