Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3f07624fe03373…

MALICIOUS

PDF

91.7 KB Created: 2021-09-16 00:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 90f3b5a89beef29b47ee0fb6e9acd2bc SHA-1: 2bc067590679e8145d0aa1740e886114fd43052b SHA-256: ca3f07624fe03373aa3e402c5e5cb7f9604f5189d91349528fd58efc423a45d3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution campaign. The heuristic PDF_RANDOM_URL_LINK specifically flags a link to a PDF hosted on a potentially malicious domain, indicating a likely attempt to redirect the user to a harmful resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://crysiq.ru/uplcv?utm_term=equation+of+burning+of+natural+gas PDF link annotation
    • http://waxiangyuan.com/upload_fck/file/2021-9-13/20210913060310777764.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/wededikulejinufap.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161397b98acf91---bedupegaliteniviripitif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130724ad73b1---97152722774.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/71717827332.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210911163443.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/99058800484.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/22264283233.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/redobalopum.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/foxafegikirijekep.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/21592786579.pdfIn PDF document text
    • http://pasted-radio.de/web/files/58621422616.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/lidas.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613af89aecc6e---56093245492.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/tebufeditu.pdfIn PDF document text
    • https://digireg.at/upload/rupoxugav.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/33625481110.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ad6a6c8633b933021947fe384bdb38be/27887807202.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/wuxawosogilerito.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/18307460508.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/73742182573.pdfIn PDF document text
    • http://thaide.org/userfiles/file/79085579929.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/39904935776.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/nasapaxoni.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021091312173480.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_off000101c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D4 18276 bytes
SHA-256: f88a74edcfa41aee36e9dbe82d6e96d6f3c1b003abf3668d00a1df67624374db
font_02_sfnt_off00014911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14911 10628 bytes
SHA-256: 4f6d32dc5b425bee957495cbebbbe8bcc8fd09a6f1694feedaca03c03b428de0

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