Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b77db9f695ea983…

MALICIOUS

PDF

122.5 KB Created: 2021-07-14 06:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 536d3a139e293c5c62667dafd5952829 SHA-1: 8bb24731509d550f6ea29f907e2d3e791d23fea6 SHA-256: 7b77db9f695ea9833891e66e4953e48f63028f420977d13fd4afd66982029b3e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://aire-limpio.com/img/editor/file/vazesifumigumowat.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b27e2e8ff97---mujopet.pdf
    • https://champion-osk.pl/userfiles/file/31669823714.pdf
    • https://nusbetaja2.com/contents//files/47644159385.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9ba2fcinrabkk4lj4viemt22k0/megaxajadisubasenawafezu.pdf
    • http://araonline.hu/uploads/file/31243323359.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf033e65ecf---nopipuvolozupegowegema.pdf
    • http://mastera-mix.ru/ckfinder/userfiles/files/nusevaxezaledawinelarelo.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36460bae5b---67967605781.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81892401e6---jimuzo.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082adacc0ff9---suxokigenagosodu.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c59c52948f6---63490972179.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e535f65ccc---20587793679.pdf
    • http://gtlmarinefuel.com/userfiles/file/16063715648.pdf
    • https://turbooto.vn/upload/files/75461262175.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092b10650de6---50369857351.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1167bdb48d---45713192530.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607616148d70a---xerogawopif.pdf
    • http://badaranquehablar.com/userfiles/files/dibitoko.pdf
    • http://xn--om2b25zm6igqb.com/ckupload/files/wimitalisujezagokelo.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834f0384d37---pobijobizareregetebonuki.pdf
    • https://nestaerospace.com/uploads/file/numole.pdf
    • http://dtcguild.org/clients/80367/File/fuluvagovabikivisav.pdf
    • http://dui-antidote.com/images/userfiles/file/9069270991.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/ec74f99dde2bd47864ccd7fec1afde9f/64766954675.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=10th+class+maths+similar+triangles+solutions+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ea6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA6 16792 bytes
font_01_sfnt_off000176b8.bin
82b7ae1e4fd8454f5b9c8e4b21d293f25d49b56f3018fa68fcfe8b6964bea28d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x176B8 19428 bytes
font_02_sfnt_off0001abc1.bin
30959a99fe5e4a1dab0dc74f6d80f5da53b587ab8a3516c2c146a9f8a31cd9e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABC1 16284 bytes
font_03_sfnt_off0001c1c8.bin
971c71ee1a27db6a6e4690df65279d3b5fa7e69fbc890220875260dea21a6646		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1C8 11244 bytes

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