Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33eeb99d9052dae…

MALICIOUS

PDF

88.4 KB Created: 2021-07-24 00:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 828e99fe54d5b105c6755b73d0dca9c0 SHA-1: 7a98ea4ea9a30de51fd864ca9b6a257d207c8597 SHA-256: b33eeb99d9052dae2dc1b35fc3a7967c194be9d00c2dbda9ee5a1ac943dba65b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://fitnessklub-impuls.pl/uploads/assets/file/gifugufagamoxewemowogis.pdf
    • https://slide-bearing.com/d/files/71518226984.pdf
    • https://cubic.is/userfiles/file/83264923500.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/fa3fa471311b76dc253edd6f84145386/gefokulaki.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/jnm7ikvlglf6mh4epjs1omjat4/fojanifazuwel.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/lamawerumerawili.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ab7f7d0fa06e0a133098ac7722c5247e/14701263311.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16089923d22611---63032268779.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d61683ed3e7---34754140311.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8618fbab91---73219504621.pdf
    • https://goodline.by/userfiles/file/watusodagifa.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7424a6ccd3e456175a38a492c09a05f8/lasosotabobijomikeko.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607764f79d271---vasuzesaguguse.pdf
    • http://polaryachts.com/res/wysiwyg/file/21538220997.pdf
    • http://namjapizza.com/app/webroot/files/56915931960.pdf
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/17198474863.pdf
    • http://pincailight.com/zk/UploadFile/file/2021061316440473499.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccc79c57bc---40618678895.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e006a67446---kokuzak.pdf
    • http://playbabydoll.com/userfiles/file/nagifediwakuzajuzebiva.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a923e2e82---65673766548.pdf
    • http://adria-ex.com/taturuzunatutonoso.pdf
    • http://mid-europe-ex.com/images/blog//file/letef.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/3c3da33127f0888564f23865a6ddbfec/katatexolanonorinotuwakej.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3e2b1dbf2---tadazuposimujatebu.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h7p3sjulooccv8joog4vgblov0/95382885386.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+are+the+five+magic+words
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f65a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 16792 bytes
font_01_sfnt_off00010e6c.bin
7394fb8a6c5870c23eef579f20e1961cff5bbcc857ddfc35c35ce4e770de5bf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6C 16912 bytes
font_02_sfnt_off00013a96.bin
398bf4ebc6bd1df26a9abb2d804e592d5c4c9b19e3ce4a2fae8a4c18e376c407
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A96 10920 bytes