Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ca74441b94b12a…

MALICIOUS

PDF

92.0 KB Created: 2021-09-20 05:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e2052d39feb3d41a985e726851b05503 SHA-1: e37d5cb53d40eb2cf90302594fe4544f03a502ce SHA-256: 44ca74441b94b12a6e5ae0998b4255dfcd27ac85a319dab2c2bce4a9a4a7b32e
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate that the PDF acts as a link farm, pointing to multiple distinct hosts, some of which are hosted on compromised WordPress upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely responsible for initiating the redirection or payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://parvazyab.net/basefile/api203/files/xipewasigezojewepixi.pdf In PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/60203789636.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/25505692242.pdfIn PDF document text
    • https://emmaushuis.org/pages/nixedugofo.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///89024181771.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/93417756459.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/37179722013.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456e29be326---sezepaxudokosaseg.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/giporamoraripejunolug.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/kuxegav.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/tawurarabed.pdfIn PDF document text
    • http://donghotam.com/luutru/files/49643838274.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/53445029951.pdfIn PDF document text
    • https://matratva.in/userfiles/file/66296811970.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fe9db7p145ea13jjm6i8c6ka5u/kazid.pdfIn PDF document text
    • http://kotolantopeni.cz/file/77512851298.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/76175765259.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141adc788d34---dokezujokekiseb.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/diguzonevevig.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210920082310.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/8373816846.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/lopexajaxakodojasonozafi.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/xekodatimosajovutokum.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de8a57ad26---virogosinelire.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135aebbcc1aa---65573329859.pdfIn PDF document text
    • http://minipit.com/data/files/18648628100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=scandinavian+gods+listPDF 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_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 21688 bytes
SHA-256: 52f96cdb7f13c7cb10dd564c1881502e6b59fe11f9358f9b903ba324deb506e6
font_01_sfnt_off000132e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E1 10456 bytes
SHA-256: 82fb9de8cdc1a4cc6ec6375fc55d8d354556858f07e3394abd7fc7b2c34f0d8f
font_02_sfnt_off00014a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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