Malicious PDF — malware analysis report

Static analysis result for SHA-256 be949c445372d9d4…

MALICIOUS

PDF

68.9 KB Created: 2021-09-30 10:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e551cf5bcf6c163c54162297507c14ce SHA-1: 67a83384d9ff1b84dc88a8dacc7024220a30f2b3 SHA-256: be949c445372d9d462364d56cabe808ffbaf892036af75e31079b18571e5e0a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging strongly indicates malicious intent, likely to lure users into downloading further malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://jmk.kr/ckfinder/userfiles/files/dizofes.pdf In PDF document text
    • https://martabaktelor.com/contents/files/18233769934.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210907013019.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/lidofoxewibij.pdfIn PDF document text
    • https://dasyueshan.org/userfiles/file/fudizex.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/57028977298.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/4653f1948b1d9ee47740e16786c6fb32/zokujiju.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/jamavudamevegi.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614592271713e---xupuxasukefaxaku.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/dendag2hq77dbbsdvqt373nup3/69153095029.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109040457271969.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23990751955.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615089a37bc08---21468216757.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/zuxaze.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/2109092155146893017f461w.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/loludupujeroxoxa.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/wudivijozifufaw.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/mozexotel.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/80290457381.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ea467aafb---mazolipivejalanomin.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/70837662527.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/kaxoxomojivunujodenane.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/pegujekuzujorosaramujaxi.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/10961440142.pdfIn PDF document text
    • http://www.depomatrial.com/file/49837024258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+subway+apkPDF 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_off0000b127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93E 10496 bytes
SHA-256: bb95f54f4002b8d88678394339b872ddc128c409d3c3d5636e43a65ddcabc2c1
font_02_sfnt_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 14956 bytes
SHA-256: 7fca7141f1da5f7dea94c968381a3230af31b37fde1a74c6f8bc6a1958901e4e