Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b45dec694dac9de…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 18:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5dcd7dd5c35de69fecbaa7434d60dea2 SHA-1: 5018b4609d7ae39111d1323745db91bbab043f04 SHA-256: 3b45dec694dac9de04d1c3933a38dca70dd65c4eacac2acae8f7bdf1687ea603
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external websites, many hosted on compromised WordPress installations or disposable domains. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://catamma.ru/uplcv?utm_term=typing+speed+practice+pdf PDF link annotation
    • http://ozona.pt/wysiwygfiles/file/86143699957.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae90517410---wumilobovero.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/25353172756.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/eelvvtb5g2t65bed54pfr6u7m0/14808204422.pdfIn PDF document text
    • http://abpaluso.com/upload/file/2563208096.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/33272826393.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/2d08ofpbhf6m6hbmr5l9v97q5s/lasubefegapidavoxo.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/dakovonapot.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609473c2eb272---32051854969.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/21156472495.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/titavatozevajotoxowipi.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/79615c29472328c03be061ba274fefa2/midunipik.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/zevolu.pdfIn PDF document text
    • https://papiratisk.cz/soubory/53265993710.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/jedojudodaxofifomifa.pdfIn PDF document text
    • http://chromoink.com/updates/file/nesodanor.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/pujetetoxididufuxejisutal.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c451e2069e7---silusepunewovorup.pdfIn PDF document text
    • https://123natura.com/stockages/files/webetojijidanas.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/3h2rehjlo1lkoq1peee0fpq071/jigidalupifazidamobivisu.pdfIn PDF document text
    • https://soechi.net/userfiles/file/jesopasabezizimolapalolel.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/6af9e26fff938978b5f778d5f16020e8/mixab.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/60308285879.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_off0000d5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C6 10708 bytes
SHA-256: 3ae4209f44cccabd0321aab411cc334af60dae735c614bf8c73dfc3cf3d7a71d
font_01_sfnt_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 18416 bytes
SHA-256: 8cf6954edc65c05f1d93d3efe7d6ac7f94124fd16e30864b978d1cb92c5d17f8

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