Malicious PDF — malware analysis report

Static analysis result for SHA-256 72cf83d3106e7982…

MALICIOUS

PDF

93.4 KB Created: 2021-08-09 16:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0354884085723758dc0f388dd2a2100 SHA-1: a96d5acfc66d1a4a78454c46b29dcfdb5575da27 SHA-256: 72cf83d3106e7982498ad5dd3993c87f5b86f0e716fe43dc25444d7e4b2125a3
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of exploitation techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://catamma.ru/uplcv?utm_term=facial+exercises+for+bell%27s+palsy+patients PDF link annotation
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/c96d93b45eb87f0a7b4ff57e5fc0c60e/9640051941.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b462ddd5bce---movobutixipugepunomu.pdfIn PDF document text
    • http://irths.com/upload_files/files/7771727384.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/33577399464.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/gororupor.pdfIn PDF document text
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/suzetomujonorubenaruxobi.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/bc9b03419316463a149f9df08455a049/gawaxutomotoligaka.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835866b04e2---65833590643.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/2564299800.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa96990d12f---87528591794.pdfIn PDF document text
    • http://ruresept.ru/files/file/22931086418.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/70763650057.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/nejemavurilamekunujopa.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/45306613699.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/776a89b14c7a41cbf0ab676163dec5fb/wudurajikegok.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad7c1755e---92115785063.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/42244912605.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/27403511491.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c23f55084a---18597444585.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/46277544260.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/r7qr10gpknnjp0ru57jbtd4c4i/sosevutifilimuwan.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/54886267864.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/f37e8d125a3f804693dc4007a78423bf/dunorurazesefubeto.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/32417731659.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/najujafikitizasesu.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_off00010863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10863 10840 bytes
SHA-256: edbf250c98b100985d51caf950eabc59a80ef8140215543bf5b76043d97323fb
font_01_sfnt_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13980 17236 bytes
SHA-256: ecabd126b476a678ec1a6e9dde77236ff364a54957abe392d48f315573dcccb3