Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5142487d41fff8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 09:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c29a0ef50d7d61a7c9671075532c9d07 SHA-1: 84d9f1e0597db9c407af66b0d2af59f21f799af3 SHA-256: 3d5142487d41fff8ea1f98df7b3cabff03bf0e0909294a8347eb5f45925258b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, forming a link farm. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The primary goal appears to be directing users to external malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=android+hacking+using+kali+linux
    • http://leadershipcareer.kr/fckeditor/_upload/file/jotexosok.pdf
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/rilawadoxamezitewagax.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a10fac989e---zaxenavogatexudowaguw.pdf
    • https://samsungdvm.net/upload/ckfinder/files/reveliwid.pdf
    • https://rawoctane.com/uploads/file/21825803197.pdf
    • http://krukaiart.com/userfiles/files/84786107440.pdf
    • http://energosol.pl/images_cms/file/73906325444.pdf
    • http://ecohort.com/userfiles/files/82195433785.pdf
    • http://hanyangsteel.com/files/fckeditor/file/884900266613a81259c542.pdf
    • https://takarasushimn.com/userfiles/files/35349739034.pdf
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/jigol.pdf
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/famewapatewevewonutuxas.pdf
    • https://mavachhaiphong.com/upload/files/43687618371.pdf
    • http://seychelles-resort.com/images/blog/file/tipapibomerosefutiru.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0e41b53f9---nadopa.pdf
    • http://boldogelet.hu/media/42105594021.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/13172106851.pdf
    • http://conomiya.com/images/uploadedimages/file/76662247475.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/313a027cb6fd922321e6b34a7e41ffe5/39237443219.pdf
    • http://shiinamotors.com/js/upload/files/62031140493.pdf
    • https://dolphinsolutions.net/ckfinder/userfiles/files/pujaxudutabuvu.pdf
    • http://mptech.vn/ckfinder/userfiles/files/18580863239.pdf
    • http://godsownproperties.com/userfiles/file/terafodafov.pdf
    • http://p-itos.net/admin/userfile/image/file/vibogotuvotexizup.pdf
    • https://fresh-cherries.com/ckfinder/userfiles/files/famezokuzedirewajorarebu.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_off0000dc0d.bin
3f451ed6a60f6ee71825f888a6e92c4301f1ff1c656a7d79c782247d8c295896
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 18480 bytes
font_01_sfnt_off00010c47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 16792 bytes
font_02_sfnt_off0001245e.bin
7cafe3174ac708099fe31bb265fb41ab7d551b5951dd01a466ba7621c72bf711
pdf-font-stream PDF embedded font (sfnt) at offset 0x1245E 10692 bytes