Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7a3535a75032e2…

MALICIOUS

PDF

72.9 KB Created: 2021-07-02 23:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 107a368f5224803d3fbe681413af0c2d SHA-1: ea4b5626ca67c163b99f28fea152b739bc2e4b96 SHA-256: 6b7a3535a75032e2bb9571730fcc75f6d09d1a2b28b60d405d244bf5e3e0b5c1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to redirect users to malicious sites. The embedded URLs, such as http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc224628ee---49745638826.pdf, are key indicators of this redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nikosdimos.gr/userfiles/file/29361682770.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/u1t2v0i9pipetq1e0bv3llo7mp/zikevapulupeponi.pdf
    • http://foto-preiss.at/upload_files/files/31468352062.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/683610a309b3e4a777ec2dcb8928c1b6/xazovixirazerupiresono.pdf
    • https://guapa2.com/admin/fck/file/59715872204.pdf
    • https://perfecthospital.org/FCKeditor/file/birejixemiluvojis.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc224628ee---49745638826.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce8a3b33f---49865034046.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2fb1c65b9---31231109557.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/9a2710e8ccd19aed4f24ee77ea51e9c9/juvekigeradarixofelimi.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/92fbd762d76be789268d5161a31e3e1a/weluwolazitexisug.pdf
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/14172778348.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb357650ee---dexotulozarezararobumazi.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c77de23c2---tazet.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/906908f158d309b83fb2a38aedc3d08b/9558741450.pdf
    • https://valve-toho.com/userfiles/file/rusuxexejuturoxaxaj.pdf
    • http://innospectrum.eu/hirlevel/file/23521951820.pdf
    • http://alanurturizm.com/rsm/files/17753227640.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a77ce5595d7---24613468033.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/0t7a2mpouvjf5hpclvp93gutvc/jekololu.pdf
    • https://xo-sound.ru/userfiles/file/dugekopededafoxezupe.pdf
    • https://vildmarksjagt.dk/userfiles/file/sosexapatagesodepabubiwar.pdf
    • http://hpworld.hu/data/pic/Image/file/juwujobijapomoxe.pdf
    • http://flatadministration.com/uploades/fckeditorfile/leruvikiduzalo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=of+mortgages+in+forbearance
    • 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_off0000bc7e.bin
df450169a5c929893beb5ce8cf41df57e3c62814456de15f47983056d4a9e9d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7E 10800 bytes
font_01_sfnt_off0000d563.bin
03e1231758a188b33d210401722c11a29c360648836e228b33207b3b4865a96e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD563 15804 bytes
font_02_sfnt_off0000fe33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE33 16792 bytes