Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b71a7562c29d553…

MALICIOUS

PDF

79.5 KB Created: 2021-09-08 16:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a845a49a98c1c7bf25be2d482ca58e67 SHA-1: 00be4133747c98d1dde44fc954570f5d1c9132cc SHA-256: 2b71a7562c29d5532b549aa3159e43a8f279a333bde3586b3513e1b9012d508e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the presence of embedded JavaScript and a link farm pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://digilit.ir/basefile/digilitir/files/3481933348.pdf In PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/wivopumakesofikedifome.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/vutowe.pdfIn PDF document text
    • https://irantruck.ir/data/file/perus.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/10219644309.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/dufidexuraveb.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/lopukosijemiruj.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/18900948281.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/34399589961.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/zutoxujexev.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/81814177087.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/wususetoxi.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137944c417a5---46042819374.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/875a08a28283c3327d4a66a448754ec8/xisirisosepemul.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134921077277---bizemuwogimuzizim.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/dedofuguxetesasojabowogu.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/89824826485.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92689603515.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/pukomolonupomukidobofowaj.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/jakixufovol.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/vewezefukewegesarewinuzar.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-8/20210908080155660053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=chemical+equilibrium+ncert+solutions+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_off0000cd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4A 11300 bytes
SHA-256: 83773523869a71a1956224aa22147eb9c404c86dddb26cfeb6740e05d8b38d71
font_01_sfnt_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 18608 bytes
SHA-256: 1f5c2944b833979a466a71b5967c5318b85e89adbcdba509e05fa2220e983b68
font_02_sfnt_off000117d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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