Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4fafaacb8bb065…

MALICIOUS

PDF

95.3 KB Created: 2021-09-19 16:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 93f213e60c23f871c67d580479c62b54 SHA-1: b051f2e7fac56b55818bc137060f503d1625fb10 SHA-256: aa4fafaacb8bb065257da2b4bb588c1f94c2828bdf9963a5533811b7ac262ae2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311832ec19f---rokawobitomejiv.pdf In PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139863fed32a---22651027643.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/68093536444.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/81242554601.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/51396634414.pdfIn PDF document text
    • https://hobbypet.cz/files/file/dojiwojijeporeranabasafuf.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/d0dp2shmtq3icajcij4unebuc4/80369848325.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/86690006194.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/47661747495.pdfIn PDF document text
    • https://nyig.com/files/file/numuwusoxelalalofilamat.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/wizarorujikupulakow.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/zipol.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/78603181650.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/55347878626.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/14671789754.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raxokijaxatepojujim.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/70640402098.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/tojunofagevejega.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/tojopilexojixejigimak.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/69400298799.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/18427491140.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/291860577613f2d15b4005.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/xagugag.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/rovekapuwuk.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/18c8b379a031ed93d9440157b472ab31/xoverabujefukuzigutazas.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/zelivojitulubipimaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=jilla+full+moviePDF 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_off00011400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11400 17456 bytes
SHA-256: 5f834da9988d74ee6ff87fc03ced6892dac88f4168b7e0bec89324af291b916e
font_01_sfnt_off00014176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14176 10064 bytes
SHA-256: 419454d22863dec1fa36273a1723c0dbb9818a3d4c2170e988ae28e1b7d65cb7
font_02_sfnt_off000157e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1