Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac09d41222e74a1…

MALICIOUS

PDF

85.3 KB Created: 2021-09-13 20:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a78152f50f664a473d625f72e86ab1f7 SHA-1: 4ab6077fe0361671b34990b7d1917a44653b51a3 SHA-256: fac09d41222e74a1fff6372f8bb09ed8b6bf983f15cca74e432640524a34accf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures or malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=p4g+tutor+social+link PDF link annotation
    • http://kunbot.com/upload/files/61998089359.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/98740307389.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea035d317---33020202616.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/xiruzatuv.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/36324359099.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6fbd86b632ddd2a8cefacafa57e7d0be/mopasejo.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/gikadov.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/93136745704.pdfIn PDF document text
    • https://chptravel.ir/data/file/wifegamulopofu.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/42101489619.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/zuzajobiburo.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/18643649474.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/vobadanotis.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/65663987367.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/29813070884.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/99272375728.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/10845844398.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/zikimul.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/78890433122.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/jonajat.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/vcuu3fof289c34i5gkiu19q4hc/45293088314.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16133066827958---22388784382.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/45232205812.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/33437474566.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_off0000e6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DD 10544 bytes
SHA-256: b2c81ab4a264257d68dd3cf9ace3c89589f533c569bd9eb60dcd3c80095308f1
font_01_sfnt_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 18688 bytes
SHA-256: 5bbaef4998c84624d4ac27d436d97f18a804ce99c90f232b3ee6e7830b354d29
font_02_sfnt_off00012fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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