Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2090f81e46858c…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 02:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c77ade838ad1a6b4cd456cd2c283223 SHA-1: 5ae74a4488fa8eb1ad32a89197140211ed4f0637 SHA-256: 9c2090f81e46858cbd6226af0e78ad6e1e488f1b4757c4497ece8f911e5f38fd
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The PDF document body is heavily obfuscated and appears to contain no readable content, suggesting its sole purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://abacusnancy.com/userfiles/file/kotowumi.pdf
    • http://medicapoland.pl/uploaded/file/zusiz.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077dc49954e0---33771819687.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/52aa6ad13e4bf253752c69003168160a/68548106988.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca037911430---42740044481.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084e257f3076---komawutekefogonupanapini.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/94f8f1d42b37ef90cf5270dd1c131573/faxekexivivixik.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a7644f06a6d49df6c086fb3176617716/69086787891.pdf
    • http://wawa757.com/uploads/files/rovilaxatow.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/b029371djr2csvr09vs2n67a19/tuselajekuliviloxasadepo.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/31255555544.pdf
    • https://getadoc.in/ckfinder/userfiles/files/62375124408.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df552e46a2---woganewopuzumolujofesa.pdf
    • http://shsclassof1970.org/clients/872719/File/nivetir.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8bf036499ab2b807a251b2ef408c0353/69311547411.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d14990b90---zawuloteguwedukodo.pdf
    • http://biurod9.pl/public/userfiles/file/levuneruxejele.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/223566b43c5cd866a2aae8a0083292d5/mugolarozuzutisijiriluxe.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/db77a4d3fc44f2d3c06b67ef12d6bf74/kobonupuzakemanenewezub.pdf
    • http://cnex.cc/images/blog//file/56987259390.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/8f2a265557f47ca6abc549e64c057c01/rafijatakapozowetomeraze.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/5c35ebde78dd0594e4e353240c22a475/46362455270.pdf
    • https://kuepancong.com/contents//files/35025001170.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=if+an+argument+is+valid+then
    • 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_off0000f541.bin
c04b5dbbefe36607eeace0353664044eb3dc7b34eb08fec6eecb317b048a4f31
pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 16588 bytes
font_01_sfnt_off00012035.bin
4b568d3b735bafb39bc769c489e4eaa7ffb406de50f9f9bfc4fc4a7530835597
pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 10800 bytes
font_02_sfnt_off000138a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138A4 16792 bytes