Malicious PDF — malware analysis report

Static analysis result for SHA-256 62240a4c04c3ead1…

MALICIOUS

PDF

121.8 KB Created: 2021-06-26 17:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: feb5185db34c5fe0871b7de9b6706602 SHA-1: 3a8280d1b5cdcfa290d7ac1035cf1781579317e5 SHA-256: 62240a4c04c3ead1c3d6b1e944e9083f8ba60a2f86cf55f12e2ec111e0fad7a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a8190dcc0---920453993.pdf In PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/5i5pf50mi1q1q18711ib2t5dp3/nuzotogotudegokomu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/84b323d51d54f3b3a3f197d14a6e5224/zikeximuliwubuzux.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/vg9loums6v798lc02nthskuhd5/wikaxudogabijuwexi.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6428bf9342174ec5677326bfbcb1ad48/60442826211.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc8aaa525b---tajavusowib.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/f1fb74a4d7a613290a156ca7abc966d4/siwuxegixa.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/woxoliluwudum.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/jovegoxagenegu.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abc98751c0c---fumigepodaxakuf.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/484860e32ccb33f5913958edd25ca0ac/wusewa.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/10387232619.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/zalovudu.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75e385ca0---47767017409.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072df8594b93---soparazufejipij.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f8cdf3c08911f6b41aad9afffb4b3fd7/53076076292.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a3675825f98e93ce6449de809b685a3f/87779262667.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/7897f9039ee6991bfa5face35fc25dd0/xabolanisefovajeg.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c12c06cc9---92664297628.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/f6lkb4vq9o5jv7o55brveg91d2/fegewigi.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c750d7a279d---lotafesovatulewerobavuve.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/suzimodud.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7999da9771---43564263756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=maryland+form+500+instructions+2020PDF 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_off000179df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179DF 16876 bytes
SHA-256: 8da82b7fe6283f46400868c68a92c95a60aa02ec3df9c17b541d738726a47f88
font_01_sfnt_off0001a5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5F9 11088 bytes
SHA-256: dd161b183d2764ab5049d8795c45e77c76e9ac6a3390c5d2ed29d052d8816142
font_02_sfnt_off0001bfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1