Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0813bca691497ce…

MALICIOUS

PDF

97.7 KB Created: 2021-09-07 23:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 56d668b36fc4b471d95568c5eb0b7779 SHA-1: 00b8208860c08d3bc05726224805180e43ed7b4d SHA-256: b0813bca691497cedd321cfcc03848d20e3962c445893e19287599a5ea195231
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous heuristics indicate the PDF is part of a link farm, with many external URIs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, but the presence of embedded URLs and the overall heuristic profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=hplc+method+validation+pdf PDF link annotation
    • http://quick-thailand.com/images/uploads/file/demefozawe.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021630238472182.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/57et5fd619p52lufe7jggtir37/92049021967.pdfIn PDF document text
    • http://127.0.0.1/kardelenemlak/upload/files/22048025778.pdfPDF link annotation
    • https://butchercurnow.com/img/shop//contents/pomojukadajonurixunute.pdfIn PDF document text
    • http://ducnhua.com/upload/files/zefarewamekifafonenina.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/f65b370050f66de8286139b117dae545/40454697524.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/56815212203.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609122c860b82---ragewepiremutajix.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/noxukitedibizulifide.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/85488186373.pdfIn PDF document text
    • http://sun-eko.eu/files/file/92314668883.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/be69d20543e15be2b7d5bc11869e2e0e/batuzenaxolujeworuta.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/9371976470.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607473b6afa04---39757461197.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/38683465098.pdfIn PDF document text
    • https://haidangpc.com/contents/files/30508492886.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/xoxulagu.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/8f39b46d9ef9afbb32ef5ba2a4a1875f/bepubagefakif.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/doveg.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/656088747ddc5ba530e7020afffac357/gofujawujemofolab.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/2skpot7c3ggnq0unfqje2m73ot/favojabotula.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/mezupesemokefofigipu.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_off000116fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FC 19140 bytes
SHA-256: dd5cc24e81fd7aaa2b91c102af03ea22f74f865176bc06c6bbf02b69190ff906
font_01_sfnt_off000148cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CD 10672 bytes
SHA-256: 0b11e976d94476ae4f319aee22746aaacafc7017cbb39b4a5076a87e56e54714
font_02_sfnt_off0001610c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1610C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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