Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce2853967eb0e7b…

MALICIOUS

PDF

85.6 KB Created: 2021-07-12 16:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ad88dd42423b71390148eab623624c80 SHA-1: 326b260f5327bc1cdf0687c65e38b2c3f30f412d SHA-256: 1ce2853967eb0e7b79293779aa730ddcce36dc5dd5e6744b457c0c465a8d0042
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d618219c65---42659893155.pdf In PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/fnqvbmhsn21dltah835tlpit63/fuwavipipetizaritomevojas.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c670b2157---56566069349.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e982772532d---7240302043.pdfIn PDF document text
    • https://tmtteks.com/files/lidoririmaxemakagez.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/6aff466d4276cb196833dc0b62d4b5a1/72965556948.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dac11b5bf---mepodizifamutubelalogi.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d1747528aa098b522202d46ced4aee11/pasazakomujed.pdfIn PDF document text
    • http://congtyvima.com/images/Download/9491802666.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/83483839694.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210512104704564.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/67q0g0o97lbqthq224v1c4ilb6/jegobatixesilula.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160875c11873dc---rikosejemawupilumorisite.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/fupejowuzafofelezewo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea2ad2703---mozagozalesimokujamigorax.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/17b2dec99a8c57cd90bfe58469bee2ae/50673095259.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874ea956f5b---29262887905.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/bifoxalome.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/kfo81hd7n9dj9tc4oj55jh5ed3/34737427373.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6f3726395---revutowotilawojasike.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a80159e7cb6---zutilikopokoredumew.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/zawiga.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5a4390ea4---fotekefaporimip.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/14367672167.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/34612884517.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c90df21e79---63914116102.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50151afe72---jefozoparafoxuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pinched+nerve+in+kneePDF 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_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 16152 bytes
SHA-256: a31c3d7cbb65377bb14cdd79cc84d1c08673cb2d935c348325bdfe835a9f1e04
font_01_sfnt_off00011929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13140 10032 bytes
SHA-256: f73b6c94eada3b6a81c0d2220c557daebfa8e4f887203d8619d37c5646943acb