Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb043f644e4ed326…

MALICIOUS

PDF

87.1 KB Created: 2021-08-15 05:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a354f9f752b4ff359dd8a165cde3e974 SHA-1: 82692f5231dba6cd9bc848a15eeb81379f25d861 SHA-256: cb043f644e4ed32690e1848fe2b780074bcb4171421f525b247a9ac3b4e236aa
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fac02fe714f519c2786e646156f0ba7c/51956125819.pdf In PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/gubejuwidaxesakaludel.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0476e8e9e---99955662719.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088ec560308b---lulivifatogolapawivut.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080f82e8ce44---97344905555.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f24ed1fe4---85130612494.pdfIn PDF document text
    • http://mq-water.net/upload/julewusiv.pdfIn PDF document text
    • http://dd-eng.com/files/files/94385881422.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/t8dd36dhoj3p221kj1386lc7r7/24320098486.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/bemeforuzuwulezugemer.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/75105052641.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/viduzixomowivinudovufixi.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/tebipikotugovi.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/a6a74b605fd6a8e18c238785bfca826b/vojejelifezub.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f65ac05520---24495432562.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ef43131bffc89e97b74e1d208c935bfe/roviwidusuxeti.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/95ced9bfe20c15c1bc767089d9230ed3/fapadefofizevojuw.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/gilalijetavunetena.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/70244595937.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/54718864516.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/h91319avjadj0f2s94hmo7avsi/mixaso.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xafokenilopekutobetekari.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/kijomubupaja.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/26531659959.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/zeritisogexipuwobimodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=modernist+cuisine+the+art+and+science+of+cooking+pdf+downloadPDF link annotation
    • 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_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 17476 bytes
SHA-256: 8ee52ab08cbdf62962525716602b5c300600d287fa15574c1be93facd031d00f
font_01_sfnt_off00011bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E3 11168 bytes
SHA-256: 765edd70cffc7aef5fcebaf169d88dc2e1873a57132d5d2dc557ab23a6b339e8

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