Malicious PDF — malware analysis report

Static analysis result for SHA-256 f756d81b4b578085…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 10:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d527ab5c68ff53150760ddaf48dcadf6 SHA-1: 42fb07c8b065f80ce34d380fe6460627ad2cc11b SHA-256: f756d81b4b5780857c868db3172446515754725bdfb7d1797bba82497a22e4a1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the nature of the document as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smidgel.ru/uplcv?utm_term=movie+zero+apk PDF link annotation
    • http://chafewyuok.handysociality.com/upload/files/68295565504.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/82759013067.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/kuvixupudulenese.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/zepemiza.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/wofikobexu.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/37229866069.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de399d0dd---rokasixezapalukogopusen.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/70712599148.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/96885629468.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/wipiwumipawejuxe.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4ab7f075f599fd9c2d81ae16c102ad70/78062426265.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/nufijowuwafotumurum.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/16446618350.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/290748129.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/numeziwixopawuwulajibenem.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/pajij.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/17016598763.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138a840e6861---717061232.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161386d191d32d---65739419630.pdfIn PDF document text
    • https://kawanmto.org/contents/files/raboti.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/97200978499.pdfIn PDF document text
    • https://eurotig.ro/file/tijixejuwezita.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/70059878884.pdfIn PDF document text
    • 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_off0000dca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 10040 bytes
SHA-256: c74025878af4552172f68ae7cfecbb9c0ad05f71d0c63c0d7dcc41000b2186b0
font_01_sfnt_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 16436 bytes
SHA-256: f90b4fd6d2f02996443874005e2a2d385f1f55ea0264598311ede0ba7cff4c4f
font_02_sfnt_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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