Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a95d2ac22f9879c…

MALICIOUS

PDF

86.5 KB Created: 2021-07-30 16:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee883e5655aa536dae5baf185310743c SHA-1: 4b5e63ab914af5d6e1ba4c8d70c8f35bc798e0f9 SHA-256: 2a95d2ac22f9879c4955ff1a6eb887703f23da373221cc12dfd84c8b067b66cc
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. These links are likely intended to lure users to malicious websites for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=gmat+verbal+official+guide+2019+pdf PDF link annotation
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/7v001p15p6ncbvqed62slohfko/98347221882.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9e275761862ca4130e77d9d07c389a36/86219646061.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b11b093e0---foruluwesumuzun.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f31c6a1398aa756bd11d7a20e4d262a3/56228644166.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/33317510294.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/na716qo675sro5ckhlpgm6bio0/zugepusuwi.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/72327225533.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/kubetuzaxofud.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160acd39c9b083---91279394718.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/a85f19d5e16cbd09e393cef376412f38/zikipuvuz.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/12ffae41025ec6a9f4eacb6c52a4ec37/7470807175.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608157aabf7b3---jejibejuv.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098453f3f4d8---dopopebudesezizifipax.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/tugefesifokovove.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/3629196980.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c89d85e3f7---kosanipurijixorovazula.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/mibajatuzoroweralefuku.pdfIn PDF document text
    • https://menu2uplus.com/images/file/99068581660.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/xudagimibazim.pdfIn PDF document text
    • http://didopack.com/files/24996498848.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021052106222573499.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/78033031320.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/kijitosotol.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/72522929908.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/supuxeripuzupurivoligon.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_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 17344 bytes
SHA-256: 4064e7a9653b10accdb7f27251ea6139a5a48565dd9c71d769bb4dfeedcfa1d7
font_01_sfnt_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 11496 bytes
SHA-256: 9000ac162dd43d96448f7f22a97f1585c7ee8c7e401cc2fd615fdbe421b5c5e9
font_02_sfnt_off000133f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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