Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f570cd805c0e90…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 08:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b6071fe11630db84e11210813224d3b5 SHA-1: 81805cd36a04aed5db4140528e316ddfe245cea5 SHA-256: 59f570cd805c0e90b592335c8dad74386a972560a0ec970bb596fcace22123b3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. Heuristics identified it as a link farm and a fake CAPTCHA prompt, suggesting a social engineering attack to lure users into executing further malicious content. The embedded URLs likely serve as download locations for secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://archism.ru/uplcv?utm_term=chat+application+in+php+and+mysql+pdf PDF link annotation
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a616e9ba9e---95013843786.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/48834894081.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/ligedominovune.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa43cac119---53458392084.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/84241233411.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/3ib9dpqfj9uitgsq9354it3d69/gutotona.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c75c1ca09---wevetumegimumog.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79314c15c3---67601478253.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16096be73b37b4---jawifesutunuso.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/19208055683.pdfIn PDF document text
    • https://palet-school.com/files/files/waromufifidu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f96f1acec---32595813500.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/sowukofemegotake.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/do4hl1bt72jerqalupaj7vdakl/98198100498.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/39656836968.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b4b558143---wilopegivanamivejoxo.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/70999178801.pdfIn PDF document text
    • http://4bx.pl/public/file/gukefuvilalapuwuwunizon.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///2295889287.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/0jb1o5u9selgt3jo3rhn28ojq1/kepodoniwozitusejuzom.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/wevif.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/kupimurobi.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/vajipumodazuvu.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/xufiwuralezufudibope.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/77478033633.pdfIn PDF document text
    • 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_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 10944 bytes
SHA-256: b51e7d60197b1104537c1f7ac6279ba4b0fb9b2ce11f3b06842086195a529a35
font_02_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 19096 bytes
SHA-256: dba555c236c7f9d3ddca35045941502dcc34881efdc84aca5152e6c8f600ca74

Open this report in the interactive analyzer, or submit your own file for analysis.