Malicious PDF — malware analysis report

Static analysis result for SHA-256 974d98c1485e82d3…

MALICIOUS

PDF

75.5 KB Created: 2021-07-02 04:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ca26ac90ef6a7dabea4635dbadc4e32e SHA-1: 2078dd9750c4166b4eadec99bfb0f9b3696f85a1 SHA-256: 974d98c1485e82d3e1bfff5049423bed69c0daaa984ad72ef22b25e768febfba
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://allytemp.ru/uplcv?utm_term=how+to+convert+secured+pdf+file+to+word+document PDF link annotation
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9a23c61c5---16356958406.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4aa660f20f6649caf295ed07df7df6ec/dukumesuvaxugubilagu.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/c5c29baba3af46a90a691c8ab8dd7b19/zigewuvaf.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210617_110925.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/wimumijutomixanotakusal.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/47533425500.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/dipuvobife.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089988ef092a---kegududopupivezojogo.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/82579797267.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbe048433a---2378435711.pdfPDF link annotation
    • http://orgue-chantepie.info/FCKeditor/upload/file/56082519186.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db889c925f3---47833125964.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba91bd3ed2---39164536384.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/802sktq932hrhdqk3tmu23chi5/dabofil.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/xadikekaxakexerobidipe.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607130aa97e3a---49463650959.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/8494c6483158fd7b9fa846d4d548d710/tuleditegapomulisogitazuk.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5d98j7cmmo3p6rditn4rvoi1p4/881731326.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/66a2776b513706263e8caafa8bad0e6b/58753498330.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c3b790ae02519f6a5e9997b0cbb385b6/newiligi.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/3914706770.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/41496712530.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/08959a2c22658c0db4deb2675d6cfb73/tofinesipewuzudotiped.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/bokawosebaze.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/66a9e2cb3c1d3f8ddf195feeb74dec20/28318088061.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/vaxagenenune.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_off0000c5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 10860 bytes
SHA-256: 51c3e23f9fdbdc4fe1277012a35eb510df75ce10b221f53b561207c7a056127f
font_02_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 16072 bytes
SHA-256: 9197b9c6e496366113260d69750b65fc150f6b53910c9450acae28609ee2ff3e