Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f23e05c3911d83…

MALICIOUS

PDF

83.9 KB Created: 2021-07-21 02:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ef27ade471b6bd92d8fba86ea74b2809 SHA-1: 1977a60839ff21bfcca64f9c2f61dac96d95e1ba SHA-256: d9f23e05c3911d83d6b9661328184f22259c0acf89f2d00333c4945d508ba4e7
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to potentially compromised WordPress upload directories, suggesting an attempt to redirect users to malicious or phishing content. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/tazare.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ubu1m3dj21gq9ovn44oinphep2/6554262992.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021062314443892.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/36427214308.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b875724b7---16109803052.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b198cebb708---dosoresasugel.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a04feb66da---tenidabopesavunixoda.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/65688934569.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/jejowaberimuzatomulafezo.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/nawudozasananopebume.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/8e19d7a30b79cab513bfe8e5b9607f4b/31961047708.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/29d08485a257eca08d46ac06d4c1225b/mibasemotabolenozumalus.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/gitadib.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/jawezeronisixolabobunene.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6acfe560d7---tafekobon.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/8618629734.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/dowabekuvaxisixinekotinuw.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/zinonupalurixonaxofede.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7b1cdb7a943a15f23f227c6eff22b3ab/ziregaleku.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c49f3bd6188---75486064957.pdfIn PDF document text
    • http://cortabellanews.com/userimages/5091937960.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/81140917864.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2e058845---ruroxalojasa.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/67767477355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+get+red+lightsaber+in+fallen+orderPDF 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_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 17256 bytes
SHA-256: a95299ba5143e662b2322986acb8494466ed20e6decc04480e22334b4c2dbe39
font_01_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 10852 bytes
SHA-256: 846c77bb26a9d462c1bd66094c5465dec5b27b20fbd6a04ae2ecd49fb9b0c8fe
font_02_sfnt_off00012a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1