Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd228ee92411233b…

MALICIOUS

PDF

70.9 KB Created: 2021-09-19 03:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 577a65c54b946bc328d7515cb890ae69 SHA-1: d4439a0efea2dfe2e2409ba19fee09b6bdb90d25 SHA-256: fd228ee92411233badc836a36ddf7a6cb2192cbf45c3135258dd96b6acff7bb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and a link farm pointing to various domains, indicating an attempt to redirect users to potentially malicious content. The presence of embedded JavaScript further supports malicious intent, likely for obfuscation or exploitation. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=pokemon+shield+download+android PDF link annotation
    • https://yifff.se/userfiles/file/bojawulafabezufemojigak.pdfIn PDF document text
    • https://mimpishio.com/contents/files/21468902064.pdfIn PDF document text
    • https://harom.ro/files/file/86852115425.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/96900953095.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109091926553353.pdfIn PDF document text
    • http://sentai.cc/data/file/20210916_034320_145.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/gasonozedegow.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/xelekavikisub.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/guvavujigemojifajux.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/vowexe.pdfIn PDF document text
    • http://onelove.cz/file/46140096013.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/dirin.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161378a0d50ea7---dupis.pdfIn PDF document text
    • http://packamate.com/userfiles/marezazido.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/patuwuwen.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/333hpasukfr55sv0uh42ohvrl6/jarojakebeguxilisof.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///33433712058.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/gubelakij.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/7801914100.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/73918481083.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631875908.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/13211620448.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05fb77e23---53931093244.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_off0000b4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D6 16208 bytes
SHA-256: de95589c9875709519ae0571c89a12ab0a96a189051d26437fa27bbbbdd26218
font_01_sfnt_off0000dd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 10596 bytes
SHA-256: 4e93bfbb5af1ca4720af12e29d0cf7c0734580a71fa1d10c279b43cc0a033f3f