Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94bde272d7ce55e…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 20:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11c1b58a480cc4de0afb7604181d870d SHA-1: 5c81b62036cd49bd8b6d966c29e38de65cbd5962 SHA-256: d94bde272d7ce55e6a78a5e3c67fb59abd538326b0fc8db1be2b5f21cdd8a000
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, some pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=gta+download+apk+obb PDF link annotation
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161435ffbea767---85164628802.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/muvamaduzupe.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/japipemoposuweletifoz.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/xufesalemanuwasuvivodeg.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/nanigakomuwumud.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/65316600912.pdfIn PDF document text
    • https://casaalu.com/luutru/files/mujafixanune.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/gijedopituwezezowat.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/34013921195.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/xaroka.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/78024145038.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/99063271436.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/27386904238.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/08aaa106b715f2c4ea27d30faf9ffbad/26122292458.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/serididarulumuxa.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f14614a46b---xasibalaguvajujag.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210908230601.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/91402185863.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/rotibakigidajoxokisugu.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/34713888855.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac189e1ebf---xowakejobemafilidiw.pdfIn PDF document text
    • http://vpsystem.com/files/fck/86712522448.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/9386575536.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 18944 bytes
SHA-256: f37441d5df0ab062e1aaf17df79316c414c152f65f355a2669273d46550e3f3a
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 10248 bytes
SHA-256: 57fcef1937390dac12a9076e50aaf96dbd71250a25ca3e363f5a322beb917d66
font_02_sfnt_off00011806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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