Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3cd47af5eaa6ef…

MALICIOUS

PDF

83.6 KB Created: 2021-07-04 01:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac5739798ef15709d016f2b26a11a092 SHA-1: 147c19653c1ab9020a5be3809f05b2ada147c522 SHA-256: 1e3cd47af5eaa6efa22c80f9a79502fcdb71c2dfc99cca7945afbb87de4c92d7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7775c578c9fc8e350d530f977fd1002b/38159358147.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/k1godfnd43s1bispd31bpj5qd4/gajogemux.pdf
    • http://bitite.lv/media/txt/122/file/xaseduditejilok.pdf
    • http://reclameindex.nl/images/uploads/bisoratoligojuxoziruri.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16091569cd486c---jijawiviraruwiraxavipo.pdf
    • http://gabortech.comadmin/file/nojebomibeluz.pdf
    • http://happyhanool.com/ckupload/files/silolokuzupapapemiduzanud.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/90760342230.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e009bfb0a---1994777063.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fb9da40a27509cd0050a81dd84a81fca/muguvimomelez.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf00e01e274---13878491327.pdf
    • https://collegemahan.ir/basefile/collegemahanir/files/40239130020.pdf
    • https://haysalon.com/public_html/userfiles/file/97254294133.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/56288cfaf1d6bd1257516a537e43062e/69974394801.pdf
    • http://artin-intranet.com/ckupload/files/61565997380.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b29405df2---37351448625.pdf
    • http://younewstoday.com/task/userimages/file/woveraripupodagivixe.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3fb0cac67---wujegukakemu.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d66b8d3f9---13813022090.pdf
    • http://dobrasekacka.cz/userfiles/file/51422326258.pdf
    • https://xn--b8qxb801j.tw/upload/files/bazofabogirolikezumupe.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607176b8df13d---36282302679.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b37d04b1f2d---14112925568.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=opic+test+questions+and+answers
    • 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_off0000e2d7.bin
c6655d88e5a79cbbc540c94416d2076bff28be09dfb923b331cf09b27ed101e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 17140 bytes
font_01_sfnt_off00010ff0.bin
76251e2255aa85b06b8471554753ef03b442e70807ee84d67f9fc9bf1578246d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF0 10816 bytes
font_02_sfnt_off000128f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128F2 16792 bytes