Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e4450c1a173e36…

MALICIOUS

PDF

93.6 KB Created: 2021-08-14 23:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 014f18b5af220acd7a0db2fddb469772 SHA-1: 820cfff2e71d095d3b381d582028a072fd738986 SHA-256: 85e4450c1a173e363d2509df1f6b6f74ced978c600635262043cce228be10278
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV both flagged this file as malicious, specifically identifying it as a phishing or trojan PDF. The primary function appears to be directing users to potentially malicious websites through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://serdceprirody.ru/userfiles/file/fifunuwijor.pdf In PDF document text
    • http://allycatering.com/userfiles/42476942040.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/fizavogipanixovekikinuvaf.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/732e0034685c6362b5a12c0bc4cf04f7/xuzozosikavuborin.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609908607059d---48652961077.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cea9d36c715---vewabimuperofeni.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/528857e9fc9ca45d81802d60cf4543f1/70346291087.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/4e6pv275jnurta9qk2dgk90o81/59292792514.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607273782e86c---bepafexetilitu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af8005a0c80---93980226701.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/36ebcc5314b2d1697374d55c8013028d/jedanixokuzutosebanid.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/dc418d1311eb4d4d3490935e4b77ef9b/sevorofebig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d55fc8bfa47---23532026238.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/temagijewiwodazi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812ad828d6c---46978199594.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/51126651807.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/turowutoz.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afc6bf0e613---sumugesozelolodimiw.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1c8ba0e0---zufalidata.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/74413552037.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f459d740eedc782c7b39e6966b7a54f7/tubovi.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/i288tn76ti9dghalbh3gg1s08d/72680735873.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/97357532686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+prepare+for+medical+billing+and+coding+examPDF 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_off00010422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 19516 bytes
SHA-256: e12ff1ff8d1d51f8d43e83699eeec3ea7fe9c238b7a1f356bfda2be3461a3226
font_01_sfnt_off000135f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F1 11116 bytes
SHA-256: de5dbbdb4e49e7dbee4660deaa8ed825bb2c6683fd8ef974ae96f5ac41b7b909
font_02_sfnt_off00014f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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