Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81ad9bba18a7f5d…

MALICIOUS

PDF

100.0 KB Created: 2021-06-27 01:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5736ef126675db6ba4279cfe62cf3203 SHA-1: fc544c43f02372743b2a92e977d51b5a7ab0e128 SHA-256: e81ad9bba18a7f5dde9a30f676ac56c4da6ede511e36810f795868c04af65cac
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of numerous links to potentially compromised domains points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083594d5e805---tusubawasonekiwekageb.pdf In PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jutkq7pavhg98nu0rto1r2671n/68395016770.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/8e087e770d44da16f53615495ac2a3bc/57388509261.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607216adc4960---65669273639.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/mopasuvotaweviwukigidav.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9505ad5b42bb263f598d89259d6cbad4/61561084878.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/38053568912.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/vulaken.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609040a5b55aa---52479376465.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/81fc4231d0108cd1674197705e8d6369/rewaxenipiso.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6152e7616---71719384454.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/c4a694e8193295cb84fd095eaa9a42cb/nunuxowasufisof.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/28744b6a3fd7de24e7f4ceeb4c88059f/89271502416.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/d5fda01b2bf7a24218c0c76fa290bdd5/73280361340.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/gatikunuragiva.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc3cef099---velalipozisokejomaloxipe.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/b834aou0vdctm07kdsga6nfc08/kikakon.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/pejedijugadiko.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/78156378541.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cafe6b6728a---pixixurojudivo.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/xukifugefikemepujego.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/6659f0b0ce676dacf104ebe5703a8fa6/fenutisu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c37760dfbf---67647947515.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/xiwosam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tumor+on+my+pituitary+glandPDF link annotation
    • 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_off000125f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F6 17060 bytes
SHA-256: fddd94e3b056eae006c1576859b40c7bef9499faed091022939b53824c309154
font_01_sfnt_off000152b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B0 10612 bytes
SHA-256: 5c2c97b56a8221456c9c651fdd263db853db499bce85eee62b20bf122423818a
font_02_sfnt_off00016ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1