Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a856be294b1d47…

MALICIOUS

PDF

80.0 KB Created: 2021-07-24 23:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e19db16993a5e0a923185bcbe3a978c4 SHA-1: 4f67bed5f8bd20e826fd9dbcfe70bd80ab2e3747 SHA-256: 81a856be294b1d476d1f5c7fd77455ff739d24230b5e6c424741f5c1bb608adc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5019

Heuristics 5

  • 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
  • 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://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60a9898a1---78440660612.pdf In PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/55314247005.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3117a21275---pexeregotaj.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/0dc704bae72ec3f69157ef488877c2e1/bisovisagi.pdfIn PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/81542301323.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/16u8h8bi9ctbkepv5nclajcdli/natijamonodo.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/47250743001.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/7306110244.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e600823724---52168073904.pdfIn PDF document text
    • http://scpt.it/userfiles/files/temufenijizodebodix.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b6bf696fc7be82beb466dcdd54abd02f/88402227036.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/629c17faec6c0570969b9ebda5ffe27c/zewadogolezop.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/559850cd1c05aa5d1be45bb881fbba88/14881147221.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/posivaxufiguromovapima.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160add065e89d0---pokodawabazidojuwonewux.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0aeab5d92---568868958.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fde28ce13---34566197141.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/pqlgg350ptdbije2jejh0a4lkq/35697851274.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/fawekuvudozojut.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/wiforexat.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0eb925f69---20935810476.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/naxadekululor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+xforce+keygen+for+autocad+2019PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010d71.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10D71 21312 bytes
SHA-256: b6fa094148c81484c5ac712ad266cf5721018b225181f629179630bc97007ad6
font_00_sfnt_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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