Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a70db0657b0d9a4…

MALICIOUS

PDF

105.3 KB Created: 2021-07-03 18:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adce214cf72bf60e618adc6458e48307 SHA-1: c1f949384471d24ef4635672ab5a8d45a45da27c SHA-256: 9a70db0657b0d9a4a762812ac31811b0c559fd0d286bf1913ca0e3da1b24a32a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable domains. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://bosgo.mn/uploads/files/77572875658.pdf
    • http://anhbanglaw.com/userfiles/file/wavawafuzataberib.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084110bbbb9d---lilegotilijaxoguvob.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/cvud7qavgf07n3vqb1nrrakb4u/46490184964.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/335a1d9463a109fcfb4d05009360eba2/posuk.pdf
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/93058061745.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b551fb90e06---riwozazetafikobafa.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/621ab004a01e1d27380a95981d548799/87068225510.pdf
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/68726264727.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8de2495e90---fexajivimusaganiwikiza.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/n6m22hn06egm8jf6mbafefncgj/liludamidajufobe.pdf
    • http://hasyo.net/files/file/69983364185.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/rlhu5jvjsnno6ai5f1mbvhmv13/befowikilizokab.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e237a4a2ed---zokenazutoponutir.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cdbe99ddf---8419813234.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d7f12edca---dujonupujure.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076aa10bcaf5---35464850969.pdf
    • https://growyourmoney.in/userfiles/files/84297304868.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c08891af49d---92032608122.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/50a4737c9defe56e8574435d058c6942/zapusakafesapijogun.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077be2178745---damamoturakivesomufok.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095960d55f35---259201948.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/92716475477.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=anaphylaxis+type+of+shock
    • 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_off0001342d.bin
c1b433454f5a4190d9f7e41fe31616c73efc5ac88465ecf21b6809e1e03efbd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1342D 19508 bytes
font_01_sfnt_off00016748.bin
c5bceb5235d6cbed7bc386440e6cf642f5cccf7089ca13758496f629fa036d5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x16748 10768 bytes
font_02_sfnt_off00018018.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18018 16792 bytes