Malicious PDF — malware analysis report

Static analysis result for SHA-256 03092b3bf53fd7a9…

MALICIOUS

PDF

86.7 KB Created: 2021-07-15 20:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e166420d8848e555f45e6a9acb2acf0e SHA-1: b4f7891e26a345e945896bab66fd1ab2ade82b79 SHA-256: 03092b3bf53fd7a9c7c8e228bd2399deab3a1a63e8bedae038dbb656478a9dc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, likely intended to lure users to malicious content. The file's structure and the nature of the URLs suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b819576b33---kujaxuvobadujarimenunu.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c755bc33873---buvebalebofuka.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/tlrq2alcqkmrnmshptc5cljhs1/ruvafudawutixe.pdf
    • http://okmarin.ru/userfiles/file/fenolijekowekop.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c79bed863a---91022064840.pdf
    • http://ghioroiu.ro/sites/default/files/file/judososu.pdf
    • http://expresskaliski.info/file/xebavaboxi.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/398aa2f096fe8911ebf7c7f1770a73ed/notimuxijujobodanurupo.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b22b5698e---giwizegunepura.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf4d0c287---70193767166.pdf
    • http://travelci.ru/ckfinder/userfiles/files/turijosimofo.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607815744ab12---58728277126.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca7bdf89a2c---79619846371.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072a0d18d365---12096542638.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78b260db1---fefesuwabofuruzetubeja.pdf
    • http://kusadasidentalclinic.com/img/userfiles/files/xarimunetegumodisako.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/bedecbeebaad11a5358a715ab00d31aa/valudasaluwi.pdf
    • http://absolutelyneon.com/userfiles/file/19613474883.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1225e181c---40194938442.pdf
    • http://didaconcept.com/admin/fckeditor/file/33182792670.pdf
    • https://mytopics.it/uploads/file/19440177650.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6d6906ecb---9019678186.pdf
    • http://alde-pace.org/ckfinder/userfiles/files/23225899335.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b2ed1b710---rujufofirowakupalatirafi.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/22e56e207baa907c44470c13e27fed3e/9941976444.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=reach+out+to+them
    • 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_off0000f231.bin
2c758b8a573ebbaad03bf1d6113d00c35f23fc2595b40d7559ce4a45e3c4f29d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 10128 bytes
font_01_sfnt_off000108d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 16792 bytes
font_02_sfnt_off000120eb.bin
d8ab35badd66b2e9f965f08d0534433e7f3a33513a2ba05cf3851b357efd7437
pdf-font-stream PDF embedded font (sfnt) at offset 0x120EB 17144 bytes