Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14d27d40232c1d1…

MALICIOUS

PDF

78.3 KB Created: 2021-08-16 20:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 696a6b1f5c34a48ca5b3e4efd10b38f0 SHA-1: 03efe9c4be46d2cb041cf0066d72505f1a5db4e4 SHA-256: b14d27d40232c1d1197f9f80139a1f93ea103d071f807720e1ffbdc01909017f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external links indicates a potential for downloading further payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7121

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://lncxjzxxw.com/upload_fck/file/2021-5-20/20210520121312403320.pdf In PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0b563d3113863bcf0c3c7b12fee4eda0/bavivurikebasifixut.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/53a22cf8c22690765877548acec32452/laxivagik.pdfIn PDF document text
    • http://446888.top/userfiles/file/98371557862.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/maledolorado.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb359f00ee---fedevalebujabefo.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/13795980534.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/rewusidumavakamomumivijeb.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/d85pbq04if4g0if4lgaaocfjgh/kazupi.pdfIn PDF document text
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/17088200778.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/49548419207.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609479ea83377---32468265008.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/40252576145.pdfIn PDF document text
    • http://grimastone.ru/files/21213068547.pdfIn PDF document text
    • http://yuha.be/_files/file/zimepabudinirozi.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67bcbb2b2a---wijinuwokolonobe.pdfIn PDF document text
    • http://yilip.net/userData/board/file/luvopolosajumurekuparixi.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/boperave.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d57c4a241d---6282112581.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/32399004138.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/75640480589.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/xazapuxenomuzesuxewuwan.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7140ab2352---momiponavekobezeniw.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/60783590990.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a3a3b6154---vajedupuwenogiberijide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=leave+form+for+teachers+pdfPDF link annotation
    • 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_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 16608 bytes
SHA-256: 17af6adf96b1ada7209d37d528d821b7f30a6541a587b7a67415096960936b23
font_01_sfnt_off0001061b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 10668 bytes
SHA-256: 1bdb5411498d67028f4ed75200a4f84b58b043b0605c00b1fc634c8ec732447d
font_02_sfnt_off00011e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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