Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb443b4ec3fc7e63…

MALICIOUS

PDF

69.0 KB Created: 2021-09-06 02:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f73dfed3fc38a9414c63a4f1cf3a74f4 SHA-1: e5fd83538dc3c4b2c206e8a154e82c5c70f3b20a SHA-256: fb443b4ec3fc7e63c0d6a5216b8c45ef214403398cc76c5be83ec9d77f9ef1c7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to external PDFs hosted on compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ajitcoatings.com/uploads/lugurevebaxenawu.pdf In PDF document text
    • http://myucmas.com/userfiles/file/69742381344.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/zinameguzonenoso.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160947167b07f1---29204171231.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160739613b2c26---vujupepev.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84d61c6b3---mubekifalo.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/ladumapexinif.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/76799589944.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/lunuxusowi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/09l741cmecglemdstgtqk3ojd1/gezuxoxerudipezigifowosor.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/suxumepemasidetovoded.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/jipunotegugadegos.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/joxezukisokalidexi.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/newomiferebujazazu.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/buvitijaverekogefefav.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/revajuzibulenudi.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/007ade1b63e895848f97657c09603358/taritedamumisasedibedoka.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/temoxibowefudesifijevuv.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/84n6a2ir4klulvnuq91m07f69e/46454294369.pdfIn PDF document text
    • https://www.cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/63431280029.pdfIn PDF document text
    • https://eguiders.com/uploads/vewane.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/2abfd6fc29efc5da24a21ba8fceaf9f9/2299100454.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c865054cfca---pijusenirekilowusijomufop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=controller+area+network+projects+with+arm+and+arduino+pdfPDF 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_off0000b133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC945 13808 bytes
SHA-256: 079c5f16409728ab8311aea21f2527aa139e9556f9b61cdee0cbb87d03bb850c
font_02_sfnt_off0000eb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 11324 bytes
SHA-256: 6d76a166e7d9ca71b56d6fe5d130c98f374ee36e6ea8b0b98380bd4ebae6cbd8