Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd977c7521a282c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 03:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c1a320011e789892a8f57e0837e2d49b SHA-1: c6a8d10c22a764155d0cf374ce2d894ccaca58ad SHA-256: 3bd977c7521a282cd5d90f079fe6350a4803fb57fc92ca4a216c6de79c10ce25
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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://ivanda-commerce.hr/userfiles/file/61002049044.pdf In PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/2883816547.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/sovudizizetuweradi.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614166c288a35---90026012174.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/tazodukigibamirexal.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/71839967660.pdfIn PDF document text
    • http://cga82.com/admin/File/lujejavomenomezadose.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/ruvizidi.pdfIn PDF document text
    • http://oilspecchem.com/files/88501353438.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/lizosetis.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210902/file/16305998402168.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/midadoxezumiranoda.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/4102466501.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/4854220441.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/96867131956.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210912_BDE1D2F536924CCC.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/85272632398.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/12837097834.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/zoxabir.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391bcfb6f04---31239576628.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/14912390174.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613503405b37a---bulomigibodapobime.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/tbr6evrmrg4tvmeuikmbeolj52/89461635532.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/zifudosezunirerezujev.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/narivoril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=apk+pubg+mobilePDF 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_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 18348 bytes
SHA-256: efe616c9f580f7b713e54c19919ad064ee203b6814bf27ff97efa7f096a79ac9
font_02_sfnt_off0001258a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258A 10276 bytes
SHA-256: a5f774315cb8e924980ad0d354f5f2ce943116372340d12898f163023855ad4f