Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c733955988127b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 17:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85257a52d6db7fb2023e035c0f4885c6 SHA-1: 49714e2e468fddbd804b1aa55daee7d42f83b257 SHA-256: 58c733955988127b4b081ea5af792b5e32e3112bed35fe3f0498557c3e060441
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://drairtools.com/ckfinder/userfiles/files/sejaveman.pdf In PDF document text
    • http://a2kat.ru/userfiles/file/50239226246.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/25350962699.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/tijamizelex.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608327f048c1c---75622478481.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/8f47613dabbf71517081ad10aff0617f/26160528368.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/xakelipodefisave.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/76852228654.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/wamununakirojop.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/4330749946.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/31599110710.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/8pdfg6rpog51uhlr96a98l6fbc/zefariwodew.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/28/file/34605673395.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/zuzedigubafitukodujegug.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/70670954274.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/rikik.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/76077309755.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/xovamuzofutojalefaz.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/lefejibej.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/punobafulezekemubava.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/b2il7cp3b0r9v46o0vfc445ecm/zifimurelupafi.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6a81960125686b4df488fc704cf28093/tumakubowijibibunoxumamix.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb36b6676ff---23028538510.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a81f274b95---13792612730.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/29054096629.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/704233527.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/femavepimazana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=corpus+hermeticum+the+divine+pymander+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_off0000d1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 18916 bytes
SHA-256: da96acf56ef122ed3e5032fd93e16f7508b104d1365546bf843c887389de4ddd
font_02_sfnt_off00011b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 11152 bytes
SHA-256: 69988321bbdc07356f97aebe1e83a29ef81c1846a7b71283b679ed2d7b341a11