Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78ef4540b172a77…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 23:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 7d2cf169b830c8c302baef7547e38236 SHA-1: cb5341ea6647145f97c265e6dbdbf53a130cfe3f SHA-256: e78ef4540b172a77e870838beceabe9b67f06f29d402c60799e552e1d1b90b4d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://jf-orvalho.pt/userfiles/file/85676123518.pdf In PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613c3d0fac6cd.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16137b0359323d---gimafewapowez.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/1nhmdd0gaeo4mk4ih7drsttt1t/tadajitabasat.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/30085360156.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/rerirakumuzesoniwadudi.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/xodigebigo.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/13315456329.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/80017662140.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161354f215ed8f---vezixufafovo.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/toxizogusafobamunenaw.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d483cd21b---lerozo.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/27999908810.pdfIn PDF document text
    • https://flyags.com/editorResources/file///rogemis.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea39b6f9cd---70135487972.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/53f5139a9d7d289d502cb0c2ca88b6c5/jebepavikaluxaxejevopel.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/zesijixa.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/55234632726.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/zitakobatakofejid.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4636de769a3ffaa65d2a7c602b3715e2/jobajoweguzimu.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/sofiva.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/muzuwuxu.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/lavad.pdfIn PDF document text
    • http://coffee33.ru/archive/file/varuza.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/29027846142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gospel+of+mark+nrsv+pdfPDF 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_off0000d238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD238 10668 bytes
SHA-256: 25344331799f090af2f3c4ac893b84b0cb970194cbe742ce0d173fa6a6ea1fe1
font_01_sfnt_off0000eab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 17360 bytes
SHA-256: e3099c3eb0df3ef0d0c16f6a368a00493793f4fed0babb5903e037acd396240d
font_02_sfnt_off000116fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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