Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b8627bf7d84c87…

MALICIOUS

PDF

92.4 KB Created: 2021-07-01 12:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05c634571fbb52042d7e2eb7b3c7c2a7 SHA-1: 8292f1f50f2801d197eb49b8463e30d805dc4eaf SHA-256: 83b8627bf7d84c873e922cc644e5648becb2b7c1fa73d203899bb6eafeef46fa
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' and an ML classifier gave a high confidence score. Several heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087584487c1e---gerevasa.pdf
    • http://colorfulmedia.de/fotki/fotki/file/3237239154.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6734315af---24407281082.pdf
    • https://best-label.com/upload/files/3136071848.pdf
    • http://kvbm.org/pds/userfiles/files/zunomesedekukisi.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/76df00d04632f83c6603254312cab17f/39511173124.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be88de191e0---97268257489.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608752674a3e5---23863952704.pdf
    • http://palami.by/images/file/wadunujebixupekozefife.pdf
    • https://am-system.eu/ckfinder/userfiles/files/kuralunumipomatujuba.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4842ef20cc96078b6dcbee74c8f0a4da/29106023761.pdf
    • http://mjacz.cz/soubory/files/mebet.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ijj7llf1gl29ho3vjqqficjd6c/37353142593.pdf
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/10231668862.pdf
    • http://bmsorganica.com/userfiles/file/bupijiwinuribiraxot.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/60f49fbbda89ac5818bc8dd43868bfab/sutijuxitevixisarus.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09cb6b5bb---lisoz.pdf
    • http://paillasse.hu/userfiles/file/lafebudapajozezuz.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16087e9951b0eb---15479442106.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/hnpckjccr6g0hn8tvmd8j1nmn7/lulut.pdf
    • https://ytdrive.com/CKEdit/upload/files/laxoputopovefitinudib.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=10th+new+science+book+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_off000105e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 16792 bytes
font_01_sfnt_off00011dff.bin
398e444542b7552dce2e538c7998ee05a4e83927eaab2e21929067744b66cb51
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFF 10804 bytes
font_02_sfnt_off000136aa.bin
01a8ca09f0943458288f18112a72cd63f3e45c5a02b50fdd8d0c635ca1b310e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x136AA 17480 bytes