Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44d5b057d55483c…

MALICIOUS

PDF

97.2 KB Created: 2021-08-03 11:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99efbe283381c1b5d66b7b584d01a130 SHA-1: ef93d651145bd8b265778714d0112030d398fe80 SHA-256: d44d5b057d55483c919e7fdbbb40c050cf6c65f2fa627193b9d712c4aa4dcf81
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack involving password-protected archives.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://unsersohn.com/images/file/dusanakolojugoja.pdf In PDF document text
    • https://soudurelauziere.ca/upload/editor/file/59518929685.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/zifadumamapebumuma.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/c4fb1de729911de6c246e886c362dbdb/16996589382.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf5352100e---15469051703.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/39941061957.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/rulimotipo.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/7459681604.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210720_7360C27E8439E674.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/13a22eecf51344693f9136d640a89f92/fipatije.pdfIn PDF document text
    • http://sepremprod.fr/www/images/mediamanager/420407444.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/lekejopezuxokasuzelab.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/afdotbrqlgmvhsnrjumgttqln2/jonugivipikexodunev.pdfIn PDF document text
    • http://splogservice.ru/content/file/84203885925.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/81454128289.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8a6fd7b0e4b89565c648c6b21d27ca83/87566617372.pdfIn PDF document text
    • http://beta-rc.com/upload/files/waxuvuzisitagikowosawa.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/2c449ba14ab03df5b6fca82ef61478b4/92163615733.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/62794210839.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-28/20210728031945216308.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/74528953763.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160826779bae43---jodajan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=driverpack+acer+aspire+4738PDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4b223b801d5d00751405db1b327387af/13480810403.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_02_sfnt_off00011da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 2688 bytes
SHA-256: a2ac081e08affb0ecf0a940f0eec8b4be73ee6624f5ae6ef3b741cdea718dd26
font_03_sfnt_off000128e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E5 10668 bytes
SHA-256: 4af650ede056f2613cdc48978e09c24f93c236cf976fa6a6d1356138c8d31cfb
font_04_sfnt_off000141a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A4 19988 bytes
SHA-256: b3bb0d6959531615565da58bb3e70a5970ae5e0be5f1bae1368429bba3a65a12

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