Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc0ae8a92f8b2a1…

MALICIOUS

PDF

75.7 KB Created: 2021-07-18 10:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 384520ab1fb9d81e4ca454ade422bf82 SHA-1: 77671a70cc6cfe4d9667c52d68681f0ad84adddb SHA-256: 4bc0ae8a92f8b2a1b062787390356a47d7fdbe1c8b2fb8403310f1ffbb1d9518
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • 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.
  • 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://keiganproductions.com/clients/863431/File/pezunezerunigo.pdf In PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb38fa3af09---59547700636.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084721470e37---99323672208.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f720702fc2759913a0a2f2fdca13497a/17398993635.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/vikavajudimolepepujono.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/8p67ni4luhfcaltke60vq00ill/39634526893.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/febatevosipukan.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/musagomiditikamag.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c535337c8f6---segetatilakatosigabajuv.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/vefuzidelepori.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/83973f4972dcfb6b0229b3c4701f5046/7612445751.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/vig76b12n69r4enqa4972t93l5/48737871030.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/depoxoj.pdfIn PDF document text
    • http://aweibel.com/Photo/file/momasowofadeji.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f405ccb10b---moxazujekaxutozi.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a2f73b75a---17534185720.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b825e9749c---10975115985.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/nerenuxulevanotawugorel.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/pasuduxazulukipamawit.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ce6cce386---15053242320.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/josidupanuvivazodetuxuzor.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/87680347146.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9404bf308c---mumexalupenok.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/17336460901.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/goweriposutiwalevugezix.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/mabumugidukona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=manual+ms+project+2010PDF 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_off0000c663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 10960 bytes
SHA-256: bcb4a6fe954e000fd19d003db7e6cc4b9551c96076f91801435f10a857db9187
font_02_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 16092 bytes
SHA-256: e92ee295c9f1e1942ec78c0bc7573682ea299684a997351264bb165c50053797

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