Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfeeb4bc1935fcc1…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 18:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 36672b0db57d2788d2e51d7699679559 SHA-1: bba7e951a8ab7be4cb93a59bae4a1fc45230820b SHA-256: dfeeb4bc1935fcc1cac4fee8f60d40c779ffc2519293c85862b85d99e82cc103
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=inverted+sentence+exercises+pdf PDF link annotation
    • http://sincaremedicaltour.com/js/upload/puritikenugimezotarel.pdfIn PDF document text
    • https://digireg.li/upload/zujopezuvazeguv.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/lijomukimogojo.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/lagagum.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3076139d---44668816741.pdfIn PDF document text
    • https://service-panev.com/userfiles/jofozupezeburozupaluwajit.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4ba069992---luwozimonuwadat.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/wiwodagovepijigarok.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/41035692435.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/89484439029.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/tasukujujexobiliwej.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/041ca8107ded2de9e573a1e5b68dfbcd/xoloweralu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e2af1a539---41133213740.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a7dbfe6f706812ff0f5379f07d894e03/kowosabozufovugogak.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/84757904843.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/2592618023.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907e54378c2---folagok.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/jilekuditoralofurakejabek.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/tb6ib43urlgj37dil247g866pr/vatovelejiw.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/botovewezemeru.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160947a9a0af5c---fetata.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/16607340049.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/xowemuvem.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/jokikojunalesibafe.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_off0000b995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 10404 bytes
SHA-256: ad6dcb69d6813f2d75199ab337a979908c39e7053a6b935df9f65fe610b7d510
font_02_sfnt_off0000e962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE962 15812 bytes
SHA-256: 5e52bd3189846448906bfc352e3c5d6c9d03217cc67c22558e9736ceab227740

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