Malicious PDF — malware analysis report

Static analysis result for SHA-256 850a01448abd9b52…

MALICIOUS

PDF

76.2 KB Created: 2021-08-20 11:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b00333ff10abdcddaa652b0fc2be615 SHA-1: d628fee284ed0b8a0f0df13ae33900a700c63656 SHA-256: 850a01448abd9b52d099c98de319f04179d7b0ff1fca5bbb3d1a57a598edb4f4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/69a9c1f7bdb66f5c87179dd07880b2ea/80563984336.pdf In PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210708_D70607D2485E1315.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/35095695158.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8fd4a9ace1---61727506554.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/ravite.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/26255582693.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/53848553.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/7lu6iehs3fjj6nt3166qe1fj11/12494331182.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/tajod.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/85328891510.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/41717852045.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/lilasimakozukojativavo.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/60731761204.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/44483635075.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094af008aff4---90126141008.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0da5adbe---93832925221.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/56163270591.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/1b22d252f7d63cb36b29ba3c94c6d6e6/figomutikazanav.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608134ae04920---42428295191.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/domojuberemoxirexitosabu.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bb5de2fcc---vivipusubifupekemide.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/tawinuboluredusumunar.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/32939848604.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/jq9koio8kur66g6r6ukfttqspo/58293279679.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088c75f6d4c0---girowewovadu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608350d3d43ae---fonabesoj.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/40868250589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=power+rangers+legacy+wars+mod+apk+all+heroes+unlocked+downloadPDF 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_off0000c5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EB 11164 bytes
SHA-256: 5a319d72d9eb034d25d28a46b8034d2331ac3812a37b1ae2ad0a77f1297ef83d
font_01_sfnt_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 16792 bytes
SHA-256: ea2a62eb784ad3516c3ddf5e3a069d75e8b73d1d3cd4aa1050a6a4076e647ef3

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