Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3b5ec292a107b0…

MALICIOUS

PDF

159.0 KB Created: 2021-06-28 08:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 16b3e9b1f5c458c029f6512fcaadcd4e SHA-1: 8e89c19de91aca4867b9933cbeb0d1fa93f49898 SHA-256: 9e3b5ec292a107b01120d94c1e79d8811e5505a27971d29de130b68e1bdeddd4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/gbf65u4ctv7v8l92tdffjm4v14/valinopegasodoj.pdf In PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/dd3v0mdleubosiml9da2kjkqrm/28480162580.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/kibinuxizilutukemokadag.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf3abac836---9577682437.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/90572026689.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/53415463260.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608aab6217835---zufibevi.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/91eabb093a3ac445bb99bb7a31cb2523/depurivitesinej.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a3298d43d---riviruzari.pdfIn PDF document text
    • http://ttc-investco.com/img/files/vokurigiz.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee7fc83d64---20062720393.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608193b1c29c8---17572457757.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a710785a987---66957907708.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/2713a071019677c6a64abcf8092de6b6/53187785149.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb1c772c27---31159645936.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/vumifogada.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/be0ts8r1hilv1phvjpr53nf0u3/jumiparubinalaga.pdfIn PDF document text
    • http://funperm.ru/content/file/9726518703.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090b133ab3e2---69095830007.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/58765489792.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/wamokomoxixapase.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/o383cm0v7kha5hpfte17pntsig/92795089723.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c126e1a48d---xilex.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/mt4qk6b2qtru5qig18h5i1f7gd/12470307506.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/jovefoxiforewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=plant+cell+and+label+its+partsPDF 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_off00020dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20DD3 10528 bytes
SHA-256: 4c3c07f4c655f477ac2042575f606d8e97da7b58a827698457226ac20523bf37
font_01_sfnt_off000225a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x225A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23DB9 18824 bytes
SHA-256: 86b39b5a7049719355138dae077e9c7139e6e88e9fa169b29a4363d5ce4edb7b