Malicious PDF — malware analysis report

Static analysis result for SHA-256 f625c71210cc1f4e…

MALICIOUS

PDF

78.2 KB Created: 2021-10-06 00:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01ec60054a36b05649ac29bc1f9aa505 SHA-1: 6158c58af6df1f1f8b70cda5d19b6396a5e36451 SHA-256: f625c71210cc1f4e6d961de4aa86ec0e223c1e0f96161843281a94df3ea97074
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa74a218e---folel.pdf
    • https://adikmanis.com/contents/files/bovoni.pdf
    • http://freestyler.cz/img/file/43621159837.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56535694e---wukazupudogivuw.pdf
    • http://marta-galan.com/files/varios/file/11881434221.pdf
    • http://cartopack.be/Images/file/50451169490.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9638b4b3a62eb099f7abb1a9501eceac/bigetifigigukutasixobixo.pdf
    • https://ldoris.com/upfile/files/20210920070032.pdf
    • http://madinaboys.com/easydo%20v2.00/files/uploads/lufakarunixabebumuruwofe.pdf
    • http://labradory.pl/file/26498083700.pdf
    • https://economiadecomunion.net/ckfinder/userfiles/files/kazetexu.pdf
    • https://vinocastillo.hu/editor_up/99608645294.pdf
    • http://pyhunlian.com/uploadfile/file/54894036959.pdf
    • http://transchem-tech.com/Uploadfiles/files/zosawujumufu.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1bee992b3---10289284914.pdf
    • https://ls-machinery.com/uploadpic/files/202109251313283386.pdf
    • http://yushendesign.com/images_fck/file/1630952822.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/abcb29f7bbe15aaa78709a98a9ab00d4/rijasojewuvekoloxanosifad.pdf
    • https://hogies.com/includes/template/uploads/file/44551515272.pdf
    • http://allmedicus.com/userfiles/file/28249053428.pdf
    • http://esistore.be/userfiles/file/5807700845.pdf
    • http://www.slenderclub.cz/ckfinder/userfiles/files/1716576644.pdf
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/magisofitejafinuwobanud.pdf
    • http://inphuduong.vn/upload/files/31947630829.pdf
    • http://mgtuae.com/uploads/file/pitozowafujapozapuwogev.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=chopra+and+meindl+supply+chain+management+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_off0000c8fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FA 16792 bytes
font_01_sfnt_off0000e10c.bin
3884bb256ad7096b706122d51b070e5b137b28aea8883110dd583b2e24cbc8a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE10C 18240 bytes
font_02_sfnt_off0001104c.bin
a72fade2b59eb456cc6265480ad657761b6249eeed0a7ac04650d94416da915d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1104C 11312 bytes