Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d72f78302285edb…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 08:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3fd98cea654f63ca87416eb2e03ebc2f SHA-1: 88cf5d917b461e1f1d4e2f3e66d673ea73f586c7 SHA-256: 6d72f78302285edb1d20e70228083eaa53bbfe07dba2562377300d3a6e229bd5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports a malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=is+my+macbook+air+32+or+64+bit PDF link annotation
    • http://xn--h1aeekk.xn--p1ai/files/file/47396609004.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/80681302680.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614298e281507---zobekubunugas.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/39752853095.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/73549599269.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138577007f2b---15430079046.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca39a24e85---81520718460.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109220355464916.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/69335040924.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/tenumejatideva.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/saxewalolalebetuxisupur.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/xakaduwafewimiri.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ppjern8u2rhcu6ce7dqdfc0egs/79573789430.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/kuburonasibifexi.pdfIn PDF document text
    • http://haai.org/upload/file/xulusagux.pdfIn PDF document text
    • http://zimmerei-possert.at/42803425171.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/zopidatubul.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/2058476137.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/79170614500.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/48866833998.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3e0b6588c974f08c0085ae55b1f71dfd/6992658373.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/zafizid.pdfPDF link annotation
    • https://penmypoem.com/new/admin/uploadfiles/file/zapofusedomeb.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/68634565392.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/refubedowibako.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_off0000b360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB360 10944 bytes
SHA-256: 51c8d45dfa6a0091805e739a88061a48a72d473e9d9b96fea537cd402e8f7783
font_01_sfnt_off0000ccf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 15564 bytes
SHA-256: fac1f1e8f086705bfc9b0c9484466b9a2cce0117faa32b8cf90804a69c4f51e9