Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3b038d36dd69f3…

MALICIOUS

PDF

96.1 KB Created: 2021-07-30 21:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a5297df09c9c88d7dc122fc630ee0b6 SHA-1: 7019138fe4639934ecfe3f95080288b45f1c546e SHA-256: 3b3b038d36dd69f3a2f58020dca052d92e85a06b25dbade36a3abc9b01c73868
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised CMS upload directories, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings and numerous URLs are sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609c26ef46c91---83781879723.pdf
    • http://thepokeluau.com/uploads/files/43219047532.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160730fd090f7e---difobiloberuzulen.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b332001673088128a1a440bd0d3547bb/lutapaxozola.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/76746355b75da7d4cf88938043247338/fukonunatufoxoxu.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/v5ps7ko1hpnt1pbutqhn8esljn/zizomiwaf.pdf
    • http://1careglobal.com/upload/files/52725992115.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a25ef8b2b9---1278635904.pdf
    • http://3sdent.com/upload/files/19375625454.pdf
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vunepuxug.pdf
    • http://krzysztofmalec.pl/gfx/fck/file/timanukekajoredetexu.pdf
    • https://baxsporthorses.com/userfiles/file/92371347851.pdf
    • https://carparts-fixture.com/file/file/pilitajubodomomapefawavow.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1833ed7a7---37794878066.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/h8rd38a9iqj3i4hamm5u3jmn2c/sefoxajutamamapuvob.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acff87a4a07---1322553900.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/39de81bd6351e54edb08f209cdd9d122/tipawokitiroreru.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f232d0bb7bc---44686529595.pdf
    • https://avayemehr-carpet.ir/data/file/38528890854.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/7419ba9dc27b210f48205739d539fafc/bazekutufanapubojoz.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/a444ca223fe170942d01190c314eb54b/47435787143.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=usher+my+way+album+zip+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 16792 bytes
font_01_sfnt_off00011247.bin
11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 16228 bytes
font_02_sfnt_off0001282a.bin
bf70e41822ddf31f2572c83c9c3488536d4eb935291712ed6646c53ee8076c55
pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 18360 bytes
font_03_sfnt_off00015878.bin
7a77a42895e5e3a38cf160f9a43a352392652968a327496f0eec655c925ea7cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x15878 11068 bytes