Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed12737109dec04…

MALICIOUS

PDF

88.7 KB Created: 2021-06-30 11:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 628eb29a718ebc51eb4234d91aecfbc9 SHA-1: 6cfffb933be2a0890872f3f21fd66de6bdbc1f11 SHA-256: 4ed12737109dec0491ff5abb518e837dd51a2c0efc21a2b228f2ca8e0ced03b4
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards a tactic of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bidmitt.com/img/files/file/ruvedezizisadawiru.pdf In PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1537764648609653ac1c351.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16089d95a00387---tumezabosexesuxekalojimoj.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/gc7ho6btmj5ma6ohc7u45e7ola/27573755882.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/0b2264d6615750c82e9658783f6c60a8/xivedekimogumojuginodeli.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1ca02ba5---ritujizikuzewimapid.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75a952a66c---92023346053.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ff8272df---lamumepidu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079675188b4b---barivosatuxizitugalixe.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/92319248651.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f4f04f4f01ef4dd46f2995ef1a656a48/26252509853.pdfIn PDF document text
    • http://strandedtattoo.net/file/jizibelojojewarexeb.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/13559638073.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/57962529894.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/0468145ee6c8f8617ae03d40bd1adc52/musem.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9eb78b79a5---74120863575.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/kgm0obbt62fuld62tlttge7d9e/7404349119.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a92fdc90da5---remikasumirusejadukeziwow.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/66840767207.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd5547ddf7---33429872671.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/vuzamipegefiza.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0406934001620347523.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160baea539f03e---molutevifiritove.pdfPDF link annotation
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1i7fgem1u02g441pi4al50gd10/geroven.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd474088e16---nasores.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=engineered+septic+systemPDF 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_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 17316 bytes
SHA-256: 6ba1283a86edeceb2bf91a31d0b7289cc0b255146682e5f547c6316703829cd5
font_01_sfnt_off000123c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C4 10624 bytes
SHA-256: dee742b862e27fd8ce6455737f4c95b513fe805cb5d849b093aaa2bfa6ac9364
font_02_sfnt_off00013bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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