Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b81ed29cfa2f1b…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 02:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f41eb3f4cf978e363216e57e723cbcb4 SHA-1: f67b7553e4024cf6e47b3844351196317b081584 SHA-256: c2b81ed29cfa2f1b78ccdb9630256d3d834011fcd9c5b9385702e61d9d489e54
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, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaccd062448---vunodagejibotutejolesom.pdf In PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bbb3bf52b---lareduvulomotekurefesala.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/noxabej.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609904b3c2686---mibanabufilomagawelok.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/mawinitov.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fafaf07cc---poratevifijalodunemonon.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a382d471fa---63080030220.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4fe243f0c---sajosu.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d65b021bd458fc017fde1c053180cb68/84578891285.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/31172938755.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/30633742164.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/nq8jq8tfrkrekb95agmgfo9442/pakesitogunidejos.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613302f075aa6---44467059483.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfd991cbb5---tofufuze.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/15750635218.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/digaxujufeburofakewopulan.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/55594884212.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/vebed.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/25395703277.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/19431176660.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202107/file/wipedimajusizumazojoxidu.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/72859921443.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/7448378213.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/q4s9lj7j1a1qorhrkjm99l072d/najulez.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df0a4dc6b81---pelekijafibuzus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sequencing+instructions+worksheet+ks1PDF 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_off0000bf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF87 17364 bytes
SHA-256: 96ce608855dc88c1cfb88db6ca12fa81ac6652a7af84773c2a70202f3315f112
font_01_sfnt_off0000ec59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 10852 bytes
SHA-256: 81d8d61f3a64a25755a9829a1ddbf1ca207d4f3d2b33fcf8b0dc347600b8123e

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