Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35f588ee74ba38c…

MALICIOUS

PDF

74.2 KB Created: 2021-06-25 22:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b388d8731668afc6e249330fc3b7ad84 SHA-1: 23bba4855d52b935e9232a761aad0ecada465b07 SHA-256: d35f588ee74ba38cf9d057caa8bedac8127722ae6b5fdfb3e5395a1bfc4faeaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://bukhatirhomes.com/userfiles/file/zebizojuvipeserapudolaxow.pdf In PDF document text
    • http://topas.lt/userfiles/file/62006125674.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051009474249.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/dakugetubi.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0946e48ca448d280dc263236aa20fcaa/92533206943.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8106160ce---11184577849.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe7a72595---69769101279.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/93742804162.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/29335824285.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160948491ba2c6---dezof.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/l8v28natsgu0dssuhlv0thm1fl/51225867224.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/solazasivexopavomozamub.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/58083440555.pdfIn PDF document text
    • http://coffee33.ru/archive/file/dureno.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/5c95512cdfa09ed816f95339ff8fdaa8/kanowixufivemoz.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/204a408eff36da2101d525bab9d91537/71161109744.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25a2bb0661---sexumutozutefuzidadine.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/39892432151.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/30698606153.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/sirodedesizovotavazoketi.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/0dc7524aa9df4f80eb3bc88636a3bc13/18900225048.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6103d39daf5d8076abbe864af9ace6f0/26760601374.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/bc991f3dd2cc8a5e826aa02b603d2c1f/51496282636.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/mijubezolu.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/91502658116.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/d3ilfefp92b2blp1gn556vldv7/xoxerefago.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/56987127355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lyrics+wise+man+says+only+fools+rush+inPDF 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_off0000bf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9B 16600 bytes
SHA-256: 00f72618a514f842f0eecdb98fdab0e797d7aa51fdea673fd2542fd0925573a8
font_01_sfnt_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 10760 bytes
SHA-256: 14224ca0714892f3cc0220ff29a7fff56ec6bb1e182656b4812566f56e40579a