Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c7f67db1bc1bc6…

MALICIOUS

PDF

100.6 KB Created: 2021-06-28 12:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c8e656a5f9a806ab139acd3f0576966 SHA-1: b09a2f98ddbac9d3f0d18ef33fe45d966064ddb2 SHA-256: 98c7f67db1bc1bc6a56d374cdfe95b66bfe1b3e3465849d39270158cbcb8de0f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c56fd2353---54861340672.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/fb46eaa1bc7cfaad1919d24982a7f3cd/zawosadulenaniwa.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/43c2499d1a3b6a4b47f532cb763e250c/45205572698.pdf
    • https://giverny-bkk.com/upload/files/jipuzanekolevofukore.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8619c3715a---79942370731.pdf
    • http://work4shop.cz/userfiles/file/gisadilafifupa.pdf
    • https://101doctor.com/uploads/ckfiles/files/60b096ce579f0.pdf
    • http://hosungtour.com/FileData/ckfinder/files/20210610_0D5A02F3119F39E8.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097a19e72dba---danumolodaxuwuzedejutu.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a82e8cdc2209db98e5f629ed64eb6bef/sidugumigojibefumiw.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/n5r7e7brk9aunf8ejqmtjt2hn3/zasamevidokulivoxasegub.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaab0ac05c---65217967564.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609451ec3a60b---pebidekixesemafuzizixa.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba47ce67acb---42262581400.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58e1c1fe5e---bipobazedurox.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8824692214---8354195294.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c7c3690ef---85633750474.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/logozovap.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/27fb4b7e7e1b32f245d52a55047c3f2c/31506779008.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/39779135bfc48218c39e48ea8ead06d0/43677300865.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/120f136ae8c1736f2fd46be5a0c071af/dazikodojexasigidoxez.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/91e24624elu6anufk2upsg8f7j/dinarilowepupejogadamavij.pdf
    • https://defaico.com/d/files/85555566612.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e6af70ac6---runugatutakibamodiwi.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/1grkj4jqo59hs3vdaa9kupp5h3/kolisanafewetovizilujevix.pdf
    • http://mousike.it/img_ins/files/daxatotuxuwivakuk.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=chapter+23+section+1+a+new+deal+fights+the+depression
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122c3.bin
9072ae6a024b8aa762e38acf7e355b87ee3aca55368277e1c04a777e0d57a566
pdf-font-stream PDF embedded font (sfnt) at offset 0x122C3 17948 bytes
font_01_sfnt_off000151c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x151C5 16792 bytes
font_02_sfnt_off000169dc.bin
79d40dcd2aa0ade6a44e23591002bf057c7300031a6f864f2b814823e29043e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x169DC 11360 bytes