Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc1fc0804a7ef1f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-07 06:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c698a9a602fb37b5595ed329110d2ffb SHA-1: 159eb4e23bb77680b3c551622a896f188d1ed0ee SHA-256: 9bc1fc0804a7ef1ff6c29252d71fdad8edeec5b53cacecc83a34a5a5f8321886
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. The heuristics suggest it functions as a link farm, pointing to various compromised websites and potentially hosting further malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to deceive users into interacting with these links by posing as an invoice or payment request.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/450fd3062bf2eaf92057f5042941e678/10606922096.pdf In PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a4a04e9ce---jilavetomefo.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/19605305186.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021062711014560823.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/xigesemotojolilub.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/sixaxusagojar.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/lofejunepeko.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/295b376a00821f8bbe03640e94847802/wodavinelelalamu.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/sazopukaresujajipedo.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/95957475403.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/kogawojalakepuvijasuwo.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d975790e33---pitasifepifefosugaropom.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/983328e10a5bffc1f425e6c1ca86f94b/guribokenexoketiwofonumam.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/9nhdk69cufsqjesln5qmke4gh6/subekamupifokapibise.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/makenuxaxejurif.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/ratiroboforozuwobawozege.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/libiramipavebigagev.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/85764591021.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/jeseraf.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/70a8d92449511d6468bc282948bbb8d6/91639508995.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863762a9086---70247334581.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/49172596150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mobile+repairing+bill+format+pdfPDF 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_off0000d547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD547 10804 bytes
SHA-256: c287d404f583099dc0288c6a41cfb68b3413de6266eb91c4d212445289a281c1
font_01_sfnt_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 17292 bytes
SHA-256: b195c65e98003c17d78cc7d5c3bb5506a045caf519ddf3bfb410e916ccdce573

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