Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbff2375e9a35d1…

MALICIOUS

PDF

87.4 KB Created: 2021-09-01 19:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 263dd8d598497c856e84f6386840b2be SHA-1: 69951764bcc960581e714aa9dd29571f7883a5a6 SHA-256: 0bbff2375e9a35d10388fefe8a859dd8065e23289e95821e5166a76dccc1f9bf
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076f50733832---jujanoruvuxuxopitime.pdf In PDF document text
    • http://poorclarescork.ie/images/77351212383.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/83014559266.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/37bae71dff42fd76b03712890173febd/zalorijixiwubobilefusuf.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b7b21f03cfac994918a736d27df52822/39262584191.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f648c52adc52cda3b78bd73debf10fcb/kulozibosafukijiso.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/kamemixaler.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/lpuj66edtp8e4v6dusm6j7kath/daranugemuposifipab.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161150b7c57eac---wikesimipadivipajotozita.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/juwufajofusul.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/46165136829.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/hhroi4rv3ggmcjmp6ctrb7um67/12404999646.pdfIn PDF document text
    • http://allasclub.com/campannas/file/mazumotuxirusebul.pdfIn PDF document text
    • http://saktigroup.in/uploads/82891772934.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/sixejed.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/87400517568.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/zanusutevibabe.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/jizozidezuwepax.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/7861812302.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/gadesoruwunop.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/a0ipeaoikcv9o19b5lo1cqr944/8728163026.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/vapusupujekixesufixi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/71cddc6ad6f9a0a1d5fbb1a4bac5100b/87215964507.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/16405040053.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/51569966012.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb0729d1b8---kunamawidoxetebuk.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/33363109491.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607967d7476ae---wabozalozib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=twitch+discord+channelPDF 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_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 10516 bytes
SHA-256: d30ee93ac98493b92d819d3c66021405b246509841b824afec6f12a2ce718ad1
font_01_sfnt_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F58 18372 bytes
SHA-256: edabe24154842f9fcbe26e15dd15b5e5081eba887bcd6c4600ce0a344a342740