Malicious PDF — malware analysis report

Static analysis result for SHA-256 5805e222c9343e0b…

MALICIOUS

PDF

76.4 KB Created: 2021-06-28 00:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ce784c566553e211ebb5dedea74748e7 SHA-1: cf1e044c8ab3feb023583b73134fa04de79b3645 SHA-256: 5805e222c9343e0bf5ca0e084cc8d8925c3ad818b7f4d7504b2541bf0ee23aee
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of external URIs and link farms points towards a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4a3450367d82071992a4ac294920d62a/tibogunefekap.pdf In PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pipoxukevufolegeranoxade.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf1334042---60268789875.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/11778683229.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/fojuvavosudilebotililivol.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/36801579828.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/solodufeforawutowo.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091de5962d77---60004949297.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/754b34rv0g643nscjk3dvvp5d2/benameritojewupamab.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/sujemesemuruguguzol.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/07b1804029d9768c34aebb32de563d52/ninifijufaxosake.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609279e1a8698---gofasubigipevaxatog.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfa2f078d5---sasexojafobadijosivo.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/bebafa.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/9116fff50d3f562004a0be1e141b3f71/50996057982.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/644eb9d2134263fd54d5eeb8ef70cf02/27400561094.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/siwepuzekijakifejag.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210603104644_734418104.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/43988007739.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11db61db76---20666288532.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/94236a7973426f7da8660dd6995eb9ce/72773542577.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/munor.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/pijudipikuwebij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=connected+mathematics+3+shapes+and+designs+answersPDF 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_off0000c4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BE 17320 bytes
SHA-256: e550d0994f2ac5e7139feb7327d7f23eac46f6ca0967930ed2f362114d244c6d
font_01_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 11204 bytes
SHA-256: 5dc6678cc4c85b403409200cc247d9a913df099cee57772170180c5a0f978f11

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