Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd8861b79bb6c6e…

MALICIOUS

PDF

119.0 KB Created: 2021-07-26 11:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 076ff7483a9536d690028d35ae0ac87d SHA-1: 37409b0b2e9367437e0551a74eba1f58847ba76d SHA-256: 5dd8861b79bb6c6e84b9a99a40a9cd73386b85a9dfcaf262c4f313a9de67c57d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one that uses a Google feedproxy to disguise a lure for 'adobe photoshop cs6 activated'. Several other links point to compromised WordPress sites hosting PDFs, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/eklvaeiuftautp3d0e3v97479o/23110972850.pdf In PDF document text
    • https://uleshuzataruhaz.hu/files/file/xadetebonutipusi.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/66182787182.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e84fd8309fb49d33fd9a88ea0cd08dfa/59322732749.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/jutubigipebonagoma.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/2794342199.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/muzudejogov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c55f1719b4---20577086472.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/tudomojidesuwekujedenewu.pdfIn PDF document text
    • http://sy-smile.com/upload/files/gawesegivokofobebidufiziv.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/54984271136.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d58495d292---70802799841.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607db1afe6a7b---bitekep.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160729bfea055c---mubakuga.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/8813589113.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/biwenogutulumofegun.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210706223721.pdfIn PDF document text
    • https://xistenze.com/files/files/punitanuxapebapitofisape.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a16e8c820af---97945539311.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/61861648634.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/jeximafejebuxugukono.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0654320c6---taremanitederemuz.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/11151481085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=adobe+photoshop+cs6+activatedPDF 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_off00016d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001851a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1851A 10716 bytes
SHA-256: 4e67f5aaee7fec8233b65643043715546c5b3ca6dc84bc27281054c9fb8278b6
font_02_sfnt_off00019db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DB4 18440 bytes
SHA-256: 326efc962d2bfb25ee34157be7cf3bad610a3e3f4a19e0810fef77bc0ae138cb

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