Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fb9af889565a45…

MALICIOUS

PDF

91.0 KB Created: 2021-07-08 05:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7939089bd538b36ad0a35be9d7333a0 SHA-1: 41edf74f5b0ff9edb9aaa0a521f2964f69a821b1 SHA-256: 20fb9af889565a45f0997873a9f3f4280b0f846348ce65cc0691a39ff10e3f43
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links likely lead to further malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dafc2880a1f---nitinijojet.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160815049a5854---81698365410.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7d0c921d0a7bb2f4b21641cbcf88a68a/5070752298.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa1e9ad17f---fepiw.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/4f05175e31cc41052d387f4d09c2c17d/93404471592.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080b853c349c---jekadadivujojupis.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb338b6f9f---69114180195.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608303bf66f31---32445800747.pdf
    • http://gostinica-domodedovo.ru/files/7439313484.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/9ej7mme1soj7eror6ko8v07jid/nanatazaxekokesubisukeza.pdf
    • http://bassbasement.org/userfiles/file/30231987544.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae648071d30cbd7c120b9b04539a734b/42224130403.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa702090f0---xazanogalukexat.pdf
    • https://zlatartopalovic.rs//files/36003828490.pdf
    • http://morethancars.nl/uploads/edytor/file/kozokoxaxutizituwolopi.pdf
    • http://asbufestival.com/uploads/FCK_files/file/48510111853.pdf
    • https://le27.fr/docs/file/votepipufetepofosadus.pdf
    • https://airflow-skateboards.com/upload/file/dumajipovarewan.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ace03a05f22---vavixosijulaxamevuviw.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ba79e59ef0bf0fe166396335a4a984a0/82257855187.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/c3a4cd2896e44031f87c33c53b44dc6b/gaxesemudojepovesimoweko.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb17be9f06---wazutirorixi.pdf
    • http://grandwatergatehotel.com/upfile_hotel/files/geferedij.pdf
    • http://progfin.pl/userfiles/file/48378300424.pdf
    • https://edusfera.pl/upload/file/gonatona.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6e3c60a20---bunakafibibesukinagedisi.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8acda406c---vixulukuxisetasipul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bulbul+in+english+meaning
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9275de6a6192f4faee2422e895469eb1/65255742957.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e23d.bin
d3c7a3f4ad2ca6a4b082718b9c682a719d21704eea934598ff185c14cbee3e8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 17972 bytes
font_01_sfnt_off00011181.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11181 16792 bytes
font_02_sfnt_off00012998.bin
0d1898a35bd2d69410fe71e500c6125d9f8128e0f99e5922e41f89fb0369221c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12998 10532 bytes
font_03_sfnt_off00014153.bin
a63b4977ddd91c8110e66024322cf87a8b508610c964d78c25ec6a5b4b77ddec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14153 18240 bytes

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