Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4c633cce42240b…

MALICIOUS

PDF

85.8 KB Created: 2021-09-06 13:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 68b68dd445e6fd2e882ece672cb3dd49 SHA-1: 2d7f869291df0481b6cfd75e68adf561797876af SHA-256: 8a4c633cce42240b0595b990142b12b204f074e4a5e7efeb30ea349f53eb152b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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=class+12+chemistry+solution+pdf+download PDF link annotation
    • http://rocb-ap.org/file_media/file_image/file/foxekenamupanunuzino.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/vumasen.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761c12db775---58538798985.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/20565882428.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e94dc9f4be---98346755931.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/26760314650.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210813162882446934.pdfIn PDF document text
    • https://numberonerevolution.it/file/beteponaratopot.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/sutuz.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/fl7ah9ina207qj06b7fk3tuj00/pagoluroze.pdfIn PDF document text
    • http://flexa.cz/docs/file/44288715855.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8dc9b090fb---45895797761.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/65461426102.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/80200709951.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/65436810074.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7b878a32---95762412384.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609294ee13497---wopitenonimasiwupanuk.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/29233874943.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82d663616---bamakodafowazosev.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210823183520081.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/542f16aebc0b77b6670250be78fb52d9/89682299062.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/pewaxarinaxabewebolaso.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/89171889660.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/58910211274.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_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 17440 bytes
SHA-256: ee2c960e6a19cc78732e2067606e853c645247b5d1a1fe7412b910d7f954f74a
font_01_sfnt_off00011652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E69 11388 bytes
SHA-256: 050d3e93804908f04c413ed20503705a5baca1b9fc85ae6d17f06e09e5366437

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