Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bcdf046d11847ac…

MALICIOUS

PDF

72.7 KB Created: 2021-10-05 01:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e52df073ea3e2eb7c4fe6dcca6e4087c SHA-1: 76a41d3ec1f0e1acd1c83cdb2fb2b25c4a8f95d4 SHA-256: 3bcdf046d11847aca5d53e7f3e19555de2ddd243e577988c7c3e470e6a6dfc30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oncallanatomist.com/ckfinder/userfiles/files/63570853466.pdf
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/42485267564.pdf
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/zixajagupoliredisopezavot.pdf
    • http://adamlegal.com/userfiles/file/laxotiwotuzixata.pdf
    • http://nitecoreromania.ro/files/file/52737510991.pdf
    • http://ecocj.com/userfiles/file/20210924133505.pdf
    • http://meghdoothsuzuki.com/uploads/71988416690.pdf
    • http://gains.kmvindia.com/ckfinder/userfiles/files/59547653389.pdf
    • http://martonelektro.hu/files/file/sodugurovufedug.pdf
    • https://wigs4less.net/nbloom/fckuploads/file/sekejatugunaxagubetari.pdf
    • http://www.santamyoga.be/images/file/vofasopusuluwoxeratoju.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c9d1caa8---51082633794.pdf
    • https://expobar.vn/app/webroot/files/images/pages/files/lakovizaduvujajesorib.pdf
    • http://abwbaltimore.com/uploads/files/28906643964.pdf
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/daxisixamasomeruvotug.pdf
    • http://moonlightmontessori.com/upload/files/81963021769.pdf
    • https://ihotel2b.com/upfiles/editor/files/14900252252.pdf
    • http://turchifiltri.com/userfiles/files/23794858575.pdf
    • https://uzmanwebci.com/calisma2/files/uploads/31255410514.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/l1hb3coii0oruoq6mpi1hjm2ua/lavupil.pdf
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/85801606685.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/7d0ee445ecd29883663c40d9dd2829d5/84817192176.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/96929051887.pdf
    • http://veewood.com/file_media/file_image/file/rikuserexadufaxopidowuruk.pdf
    • https://czus-lukasa.sk/userfiles/file/27743671198.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=dispute+resolution+in+contracts
    • 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_off0000bc09.bin
8c923b2942140d24fbdd7a1408e0ad263854c2174b826b10b72bab73f7da7d64
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC09 16144 bytes
font_01_sfnt_off0000e554.bin
d38736db7667749f553b2afa952efa83d1316ef0f8bc6725846b7a23fcc9b11a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE554 10468 bytes
font_02_sfnt_off0000fd3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 16792 bytes