Malicious PDF — malware analysis report

Static analysis result for SHA-256 20888ab9e0ad2f84…

MALICIOUS

PDF

93.8 KB Created: 2021-09-03 06:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 82d49de770ea658aa5b585288234acd9 SHA-1: 497011d299d1f7bc7432e552b8d478ea142a61fc SHA-256: 20888ab9e0ad2f84bd6610eb4bf6ff43ea6f6249abe55d75068a7a2a453bb4d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm for malicious redirection. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to direct users to potentially harmful content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4477

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://huntic.ru/uplcv?utm_term=sequence+reading+worksheets+1st+grade PDF link annotation
    • http://geteffective.biz/uploadfiles/file/69747039468.pdfIn PDF document text
    • https://digireg.ru/upload/rezeravabit.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/zaxalufuzejidivezasakuzew.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/nojomifitisaxeritipaga.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160827670eebdb---penusodijibajiruduzene.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/125a0150b5f6d250f19a13d54e689260/97848599164.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/44873352540.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/subijomimapipetopininiri.pdfIn PDF document text
    • https://banghenails.com/upload/file/65126929795.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/58030002572.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4fcf8e7eb---79549653785.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160747eea8d65d---pakudatalatokagu.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/89570505620.pdfIn PDF document text
    • http://markone-tools.com/upload/files/86925031689.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/vizajunisivolitu.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/lazazosur.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/furafumerezevemitorawib.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087ca1103d69---89109448437.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108ccf89d43c---kumevuduwikali.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5681a0cd---28857103545.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ba9d94fa---20085709535.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609018b68c224---bopelozisobal.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca6c2bb810---jimovozurugol.pdfIn 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_off0001121c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121C 18384 bytes
SHA-256: 08ccc6f09518b5034ef68e254e40ce93e7166462f4e121a344e7fea023da5380
font_01_sfnt_off000141c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159DC 11156 bytes
SHA-256: 04b76afd1be0957f2d29922e7a1950ff2dd746bcd7917028fb7fb5b64c3a700a