Malicious PDF — malware analysis report

Static analysis result for SHA-256 db91f09384bb0962…

MALICIOUS

PDF

100.6 KB Created: 2021-07-26 00:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 251e22fe1cb42d799f387b801d2cc9e6 SHA-1: f4dcb665bfcd8744c661971ebc21585be81e380e SHA-256: db91f09384bb09628a45071a228da4fe5916c864d1c78fc72962787ec4f8ccb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting sites, likely intended to trick users into downloading further malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://campcolefamilyreunion.com/clients/82065/File/12528897562.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/29547602374.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160758ee40b1cf---gojumumitobome.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00e8b97db6---zegijosama.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/to42gitr4vs2r996iurdn6tpp0/94143194123.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e43f5cdabf---79904186271.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160845bcbdea8e---5057149308.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1ec8d1e1---xiriwifogi.pdfIn PDF document text
    • https://maturana.cl/upload/file/562877125.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/jutepetexobevawa.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c7c9e3daa---99272334910.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/03879acc6f6f8aa87d8fc8d90addbfb9/texopatupumomamejivo.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/76880550812.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/458cdd8237eb158842809b37651c7fdc/lekuwajejelufuvufopixazi.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/30b33832df593dc0cd1579feef65f523/5374542622.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caf608adc62---23040213758.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210506123833.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/dd2hvh6ih3hbr2acl8ta9cv9ir/jafuvolasigumomixesal.pdfIn PDF document text
    • https://menu2uplus.com/images/file/kemisiradafixexi.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/mikozulolafirijuf.pdfIn PDF document text
    • https://advik.net/userfiles/file/93044242981.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607738e8a32dd---lesaxojezivozejimere.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/91562180700.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/refonalik.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/81678736467.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096d134863ed---32413621016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=capacidad+compresor+c+qn103l2cwPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3C 16376 bytes
SHA-256: 0b5448c6de0ed0f116d2c680d9cb6f47e90a51602807fce3603fd82f599d96d4
font_01_sfnt_off0001202c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202C 18920 bytes
SHA-256: e8f81812fcf3a4421705c31dd72af218a981f35ebec4f6687ddfc1f8e90ed413
font_02_sfnt_off000150a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A0 11304 bytes
SHA-256: df71f3ca357d27f4d556821f74f5600f5bbf4e6a4051d73b53b81b183620a756
font_03_sfnt_off00016b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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