Malicious PDF — malware analysis report

Static analysis result for SHA-256 2757d9117a1494e5…

MALICIOUS

PDF

87.3 KB Created: 2021-07-16 11:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c99fe6d7414081de8fb3a7d9bd017c14 SHA-1: adc2a030aec2f5f75932fbc34639260a6e523101 SHA-256: 2757d9117a1494e5644433aafb6091ce1d2f66396fe6f68cb0db3fd8608ee9aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest it is part of a phishing campaign, potentially using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=the+diagonal+of+a+tv+is+26+inches+long
    • http://diplomat2014.ru/ckfinder/userfiles/files/wufidevuzizegon.pdf
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/79218231acfd51d80e94896a9b48f358/30249223085.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/590a62bb34953e970982194a033e1fc9/1359134507.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/20047193328.pdf
    • https://grup-insaat.com/userfiles/file/ranekojoru.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/6c5ece87b0aeeb87b5e27bc47204942a/70343996819.pdf
    • https://ebooksweb.net/files/file/fivilerobevitiz.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/eea7caf057901599ab05e407a03c447b/37654126196.pdf
    • https://tolgyesvolgy.hu/userfiles/file/zaxegafoxonit.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985b4e2e42c---zipelej.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721cc660bf3---38660255422.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0598688dbf---jekubasuko.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/nc0qo39pcaqs54uu2vm2uoep7s/rasowako.pdf
    • http://abwmountvernon.com/uploads/files/fipog.pdf
    • https://upbilbao.com/ckfinder/userfiles/files/46454535542.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d398c2bffb6---duwawoxedijenewarajotad.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160742f75a9fee---tatezugi.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076a15f58a6a---62541603092.pdf
    • http://likebarcode.com/image/files/20210713_131711.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0af5ab368fbe6eeca8fbdda2419ae796/33357160871.pdf
    • https://martabaktelor.com/contents//files/29745537866.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a34b1b7a1ada7eeb4eee55f29f2ac5ce/luwutulolofeb.pdf
    • https://baongochoa.com/upload/file/99673650577.pdf
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/69064619902.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/1f3bcd2a159dd6747233d2f8b5feb1b1/50187627271.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/acd0c44f5604b332a12a84d8058d0d24/guxiwalowapebimev.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/84e7fa1a1af67fcc3146f46463a3c626/17818882200.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f056.bin
e0eb7b5dacda93bb5376dd0f76d9b7bc9d91e1de613102176097d77749216c30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 10972 bytes
font_01_sfnt_off000109a7.bin
2ae7af3d40d69cfac6efc5f3110dc113f3e2400e505e97c7075d3ec2a44e2b7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 17492 bytes
font_02_sfnt_off0001374e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1374E 16792 bytes

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