Malicious PDF — malware analysis report

Static analysis result for SHA-256 7477c107dde64fa0…

MALICIOUS

PDF

77.4 KB Created: 2021-09-03 21:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56913009d050306fdc99873bbebc8421 SHA-1: 7aab18c28da897a86284e0a50a68abb39b4f39df SHA-256: 7477c107dde64fa0cdc73b21d0f07e6fd54bf8207c2b849e716d12a00cff2a3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm or redirector to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://archism.ru/uplcv?utm_term=ente+vidyalayam+essay+in+malayalam+pdf
    • https://atl-50.com/files/file/91836221615.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160aa907f37d76---86771448500.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3ef667a8e---ririgigito.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b98d7fc17---41669872549.pdf
    • http://agcslohian.com/userfiles/file/loxamejedow.pdf
    • http://funperm.ru/content/file/7333458655.pdf
    • http://solar-makernavi.com/ckfinder/userfiles/files/fopazilavawowanevanaw.pdf
    • http://euro-ex.net/images/blog//file/pexizud.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/ripepubupotezagugeloteri.pdf
    • http://tecsun-moscow.ru/docs/file/88624275926.pdf
    • http://greathorserider.com/ckfinder/userfiles/files/79016839286.pdf
    • https://mebelihome.ru/upload_picture/pofewoma.pdf
    • https://associazionemusicaviva.it/uploads/file/vajekaz.pdf
    • http://goddesshair.net/upload/users/files/97948495068.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb9acd3caa---70744769441.pdf
    • https://aartipalette.com/userfiles/file/gosazabemudajupigupi.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/13a63a5a88394f9a83ef983ece7bb5bc/xijisifameralesedimisuwe.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82dcec226a---85305516270.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608611634d7c8---ravilaxifukoditawijazaji.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160719137b533e---retexagivatimutonidad.pdf
    • http://mobilenmr.com/files/files/39164644617.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ba27390a8de05d294542c30add64f17d/zeluvujodekofonolewije.pdf
    • https://cplastik.cz/data/cms/file/28364568892.pdf
    • https://ceccarbotosani.ro/userfiles/file/kiradimasare.pdf
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/39176297289.pdf
    • 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_off0000c75d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC75D 16792 bytes
font_01_sfnt_off0000df74.bin
ee5f3084a3ee4a15ab4f1b66370b6c8624df474b1b7ea98fdf5d1e8cdab8fdf8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 10604 bytes
font_02_sfnt_off0000f7ad.bin
87d6bba7033bf9bcfb9d5058ff8d303c3a7c605f2448363dcab7eec6889b97c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 18744 bytes