Malicious PDF — malware analysis report

Static analysis result for SHA-256 845422fe81724f17…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 00:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 00ee3df2b11c9265e7bda3bf1c7dc460 SHA-1: 4bb2d59c135b980f6698a2d799926a51e58f49f2 SHA-256: 845422fe81724f1782ba68f85d25e400bed94730a23ea8f1dbdd2f1f094c3484
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many hosted on disposable domains or compromised CMS uploads. This indicates the document is likely part of a phishing or SEO manipulation campaign, attempting to redirect users to potentially malicious content or download further payloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=intro+maker+apk+download PDF link annotation
    • http://tbeaindia.com/userfiles/file/nagenasat.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/69756822060.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/bizebiwim.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/viziladukid.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/bolewirugu.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/jejexowabodudufijawuzaz.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/bibirilof.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/74602911417.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/fc8a18bd93b2fa500327de70d1d85c8d/ritebeto.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/texurufowa.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef3bbde753---99189630103.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/lizewigaremobubanawejidaf.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/vajawepi.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/93314676213.pdfIn PDF document text
    • http://bamila.vn/luutru/files/14011816872.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/34e2a8732ae5baa57204d244cf629f4e/69450153198.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161335abe453dc---47912435082.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/cc6f2bf55d16179ad851712af86cd1df/69124899892.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/21381930579.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/nonoturawile.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/kikofexevezomoditapu.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/nurinenepefojelunidik.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/43914522979.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/58150248647.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/52098559032.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/beguf.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_off0000b606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB606 10420 bytes
SHA-256: 0496dd9f537f29b8c47bae29698da9197b1c7fad3a9611c8ffa5efbf05eaaba2
font_01_sfnt_off0000cda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA2 16664 bytes
SHA-256: 20b3181af14e61e5ec169a4dcd65b671a1e15dec1cc13512317d6d9f2e6605f7
font_02_sfnt_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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