Malicious PDF — malware analysis report

Static analysis result for SHA-256 46eb3a1d821d4363…

MALICIOUS

PDF

86.8 KB Created: 2021-09-06 10:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2c686c0950e7c88a454d30bd256ea2ed SHA-1: 04e9e175c4785b0619585c428ea446a4a5b14833 SHA-256: 46eb3a1d821d436373bb0b94d3bb7c7426cc95583a7a8b2c409e172b9045472a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to obscure the true destination of the links, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a deceptive content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://drapa-technika.cz/UserFiles/File/bakulijutefotudu.pdf In PDF document text
    • https://amursvoidom.ru/media/files/30102017010.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/fb0d383c6958896bdca346dbb6e37932/70167051667.pdfIn PDF document text
    • https://pcetravel.com/files/file/dedadogodujovozetukuman.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/eefock9uh16i6rbmes90ukmve6/92742827169.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021523352245323.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ac656228ba0---75749970436.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/43795795220.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/87611781404.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca104b3933f---jonuwulogogewapovitexuz.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210630074149.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/smlutpouu7nrh5dmkjsv6k1mo5/92606570643.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/kodipirigeserabawaxelo.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/f6seb6c36kukam63gijing5p95/9995615215.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/mitol.pdfIn PDF document text
    • http://krzeptowski.pl/file/ripawiwarapafelopujumit.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daf2a78d9f2---8065766803.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/juvapedafidataxukojoti.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/476912020.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/pnt58epok1o8m2ef6kj2ldmfh1/64431849207.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/4045fb71c022e45eba364609f686d6d4/timonowudafoteluvako.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/gatorivetivub.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a97adce2ff2---39754973615.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/14198512373.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9dc9730600c07e1f251f615aac801f38/bolugavesela.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/wuzebajugemumowiberanogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=misto+quente+charles+bukowski+pdf+downloadPDF 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_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 17800 bytes
SHA-256: 41697b6ce59f70c82f6900d00abd8930b46c29ac19d82d1940d2d0f56cd789c6
font_02_sfnt_off000133b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B4 11276 bytes
SHA-256: 33f63d7a23d88b6a505222b9e7b8a7c8c1a9817662c32238ed8df524d4f0a7eb

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