Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17b73939ab82835…

MALICIOUS

PDF

78.0 KB Created: 2021-06-30 08:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fc8fbd4943ee97461c6557a66cdf380 SHA-1: 683cc257016900f2c2611a149a00b0b636445e95 SHA-256: f17b73939ab8283574359fdec6ead223bf9a4f60d433dc589042d2a76e5e9e7c
176 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. Multiple heuristics indicate the PDF contains a link farm pointing to various compromised WordPress sites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and a raw IP address further supports this. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b72ac624badd0ecebf455478b67acada/fufuxijefe.pdf
    • http://sanphamhanquocymy.com/uploads/files/vagojevozozo.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/35thddin35oo0djbvcep68jeo0/50992017424.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609107e388e21---bupex.pdf
    • http://lube-stc.com/ckfinder/userfiles/files/95092929493.pdf
    • https://cakenflowersonline.com/userfiles/file/57096366986.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b82c336c975---xufuwiwelilitola.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b0c36c0dc---45052367951.pdf
    • http://www.polni.si/Images/files/kuxogegod.pdf
    • https://ascinfratech.com/clientprojects/trading/file/87789032950.pdf
    • http://0930actress.com/files/files/40814806235.pdf
    • http://fresh-j.info/images/uploadedimages/file/5311425049.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b95ad5ce6---vololibusoladivonarem.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/dfpaspsc8jb6n9vssbmrdgnj28/90097459332.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8a932af9175d389ae017d2159a3c49b0/nuwonumezakufibowupitalis.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/rhqmpekno8lhsf7eofefdo22d7/54760017797.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/semejodukefabone.pdf
    • http://nfc-lampang.com/user_img/files/35741427109.pdf
    • http://barudan.hk/UploadFile/file/20210521182142975.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/6s5djren92fqpi5q1g9phi8v6n/72891379442.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c373882c9e8---mekudejoteximemurum.pdf
    • http://157.230.241.115/image/upload/File/ronelebumizijizofuzepa.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/s8sr5cir0g8m2lq635l61rtgb8/wewudefa.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97d638fcbd---duparipuk.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1313f6fa---vubegofatebejikabisew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=override+screen+brightness+android
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc78.bin
cd7117fafbd1b88a92af01540ffbac699a16428259de8c1423d931b818cc22d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC78 10832 bytes
font_01_sfnt_off0000e545.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 16792 bytes
font_02_sfnt_off0000fd57.bin
edcbb2c822c1f2e4776654dffa933863888d5ff3eb671ef184efe08e6f432bf6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 17388 bytes