Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6d1c6b8076892a…

MALICIOUS

PDF

94.8 KB Created: 2021-07-16 12:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b30b8a75a367f5e69aae18ee3e97b596 SHA-1: 60d9218f22f40d5498ab57e3c5fde08d78ae69c4 SHA-256: 7f6d1c6b8076892a57abfc44c96f91727de49af9864979137529905b21e0876e
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://matchedtubes.de/userfiles/file/bumuxerigetaloxomar.pdf In PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a3039ac3d---kitoku.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/23897781c45f2f92543aa9bc50796147/12722232642.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fd56965cf---81774358720.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/38fb225807f7a9c1f5cb3b55fc3a469d/41973926700.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/wonefovenuwelaxolexifid.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160862582d1fd2---bipokidewixasufegomonap.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210618234654_renj4t.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/xokonasubapebilubexidepox.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/42193351521.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b70b06da071c2352c0b955a1f1e104ff/2494272718.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/54658578939.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f6b5f2b2610645463395f80f4baf589f/laxopefut.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/99465834174.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/zebipedo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607859f7a61fc---mikok.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/59167403995.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082d1b5ddb78---6318869260.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/baokrfc2ra74g0u4gahsc8r877/93059051770.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/sibifoxit.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a0d2060a714727601da3a6cfaa371d4d/93410265238.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/favodukipexemobu.pdfIn PDF document text
    • https://dm288.com/slicice/file/balipudutadusekanox.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/11770332259.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/407a44c95b5bdf3e16f18c991cd3912b/47118157882.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b33a0dda36b---zoxinisoweviguteto.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/17b0ee8188b31004855c99cc77a67de7/29144781865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=chapter+4+implied+main+ideas+mastery+test+1+answersPDF 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_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 10896 bytes
SHA-256: 46c8f1dfb4e69b72724c9b196cec63ea61299572e5ae86d033d98f388eccf3bb
font_01_sfnt_off00012801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12801 17316 bytes
SHA-256: 69fd37e8ddec6d847e85fecabe71146b6cf881d750194141a4409370f32261a8
font_02_sfnt_off0001557c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1557C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1