Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e31b216e5ba891…

MALICIOUS

PDF

93.1 KB Created: 2021-06-26 00:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2871500988fbc63a25f72b7ac645bc2c SHA-1: ded2bfcced47fd1b2caeb36f4f7f139d95a58898 SHA-256: 43e31b216e5ba8910279b24cfd4d30d3ecc4448eab61c54b244b2a49caeb1f3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lead users to malicious content.

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://philabc.ru/uplcv?utm_term=the+second+book+of+moses+called+exodus
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087db4fee92b---8221117009.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bca8cd73152---55803112140.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7d0ebc8ef---39116905160.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/8fa5f76d9adb4ea775ea17eaf4501aad/48293202992.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844b0ad0144---gexomi.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4883566812b5a2ef670b2b2ba524d6ca/simaguzesonesox.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/958b57f7d056557af464fd27c6b6f4a7/30988330565.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d43795164c0---gadoretaxapilaselafa.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16993d61b---novixa.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b462c49e52d---18585306048.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a2b163199---givefari.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f5a61d7468c41a91a472aa131701f22d/83054864480.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd10095cee---18173266851.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53f535948c---nokofurozonuvuvuw.pdf
    • http://amirafouad.com/uploaded_files/file/60780135309.pdf
    • http://marketypik.pl/zdjecia/fck/file/lipusononifaxakajezagu.pdf
    • http://chikatere.com/Upload/files/67137338393.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/70058629598.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987184565fd---juxuwinufukiperar.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/81759843291.pdf
    • http://roocenter.ru/upload/file/jerosepunikojasukirovape.pdf
    • http://daugiavanthienphuoc.com/media/ftp/file/8676714871.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_off0001088b.bin
68c02abb5d18f85da30194089d04bfd5bc7cd876a79c09b7b1e4696c593d1fca
pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 17524 bytes
font_01_sfnt_off0001363c.bin
455a59ee3806ada2b98a6d9a3e321e277a1d93c64bc2160bdbed6aef26d9b521
pdf-font-stream PDF embedded font (sfnt) at offset 0x1363C 10848 bytes
font_02_sfnt_off00014f25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F25 16792 bytes