Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f6ffa01a84083a…

MALICIOUS

PDF

72.9 KB Created: 2021-09-26 04:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 467886a7f9e5bb6e9faba3785dfeb0ee SHA-1: ddafb8e7341d8a337c36eec6db33eaf7875f08e0 SHA-256: d6f6ffa01a84083a1285cfe1650b7737bb6e87a00803066737e22470fb618285
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to files hosted on what appear to be compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to lure users to malicious content or phishing pages. No scripts were extracted, but the overall structure and URL targets are indicative of a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://irlanc.ru/uplcv?utm_term=how+to+change+custom+rom PDF link annotation
    • https://lecormier-menuiserie.com/www/upload/files/10645874536.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e2a0c5471b90497088aba862e09ed24f/40802257297.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/bobinipevokijekexo.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/nadotaponifevobe.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/75c19818ebb2869012989e7c33e3f2e7/jojuporure.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cefca6820---16840571009.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/zujogagimotevo.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/jutulo.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16149f356b62a2---19896950146.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/46342241263.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/47793735550.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/19143456849.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/nexiwawapivelibe.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/62064052145.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/15659774194.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/37191254485.pdfIn PDF document text
    • http://drironcat.com/images/file/46980030229.pdfIn PDF document text
    • http://telektrans.hu/editor_up/57968979216.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/58883555105.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/30692346814.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/witimukenopezoxodagexaber.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/54149d5dfd19ed77712dbd84aede859b/78663711096.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/58390758241.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/xalasumovatedivawa.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_off0000b2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B2 19108 bytes
SHA-256: aedc65e1b0b7bcea8958802c9b584ec2415dbd04fc540d712dc124ae764240b2
font_01_sfnt_off0000e41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC31 10716 bytes
SHA-256: 3112da44ad45b661a046b28f3f99f407d764dd76601ac1472b4373a783626496