Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6090bf86191237…

MALICIOUS

PDF

91.5 KB Created: 2021-07-03 02:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dd7cb6b9d4a5fba64a8b21bd5ec82303 SHA-1: 1c055d9add555f74d6d29c9edec7b8cd07281aa1 SHA-256: 0a6090bf86191237e40ea1bce375686a770c77118c61a0971104fedcf076f9de
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and other potentially malicious PDF files, indicating a link farm designed to distribute further malware or phish users. The ClamAV detection and ML classifier strongly support its malicious nature. The file's structure and numerous external links suggest it's part of a larger distribution chain, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://www.pranabkumar.com/fckimages/file/fugimosutenivu.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/136772f95f5c2eec2b0adee3aee47f12/joxovi.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb77a3e783---65920599926.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/89898523940.pdfIn PDF document text
    • http://a1-recruitment.fr/v2011/Files/fck_upload/file/buvuvedakiduzaxifotugeti.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4e095236---wefusifumafajebujixedod.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/85584798654.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/d67c7b2ec29b29b86a477184e5c77ae4/71423771441.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/qk44e70v75i59rt4hpngm0tivf/49789543606.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f853061c4---rifab.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8c26c6a62---63373577106.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c15503e6db---jirewetomabajaxid.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/nato07dvor1b42mur8qs9tsd03/regatazikonijubovebuban.pdfIn PDF document text
    • http://placc.info/up_image/65841245575.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m9bq2krrv4gq0624bvq6tl08u0/fitupivunaxerarepusosunu.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fb30c9f47---25695965277.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609c82a568683---76303933555.pdfIn PDF document text
    • http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/62955583313.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/kerixosaxaxobazamajo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ji53j38ki2107ue8u92u5gqflt/55508269814.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160873e1c3ab6e---vuxezajibutifidibifena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=formula+of+linear+inequalitiesPDF 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_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 17676 bytes
SHA-256: 8364e8bb6619b5126db1c5caa76131c6a8769858c0c3267b718d3184df22a83c
font_01_sfnt_off0001307b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14892 10600 bytes
SHA-256: 44853b0cf0942ddd5e1a165c9615b59b880cb93bb516d29be7fee8be45feefa3

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