Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a75a4163efdb56…

MALICIOUS

PDF

82.6 KB Created: 2021-07-31 01:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bbde677360cec9b9b53f6e0ed88b672 SHA-1: fa807e04aa57c59004398ed7e9c13bb51d534f9c SHA-256: c5a75a4163efdb5610ce4632a965317518059932b3b7f7a58b300a8827755cf3
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links, many pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of a "download button" heuristic further supports a phishing or social engineering lure. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medicentrumnz.eu/medicentrum/files/file/97727927716.pdf
    • http://obasekiestates.com/UserFiles/file/17054775656.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/86141071855.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/bc583227192fe7a4444a26830a99bd0c/23243362993.pdf
    • http://cesishotel.com/res/wysiwyg/file/jezobo.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/d2ir5dbbh0jhihkaqg0hadju4u/loduzeteserifogimoti.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/09f6cead49e59910b5855461f6fb43db/46777199709.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/ranotozosadoniv.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4546b8adf---fakanazorazetowejifu.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ab2b8e6b3---15117856954.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775750d7447---guwiramonipaxemubujejor.pdf
    • https://invest.pl/userfiles/file/72704299683.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b180d855988---83240654185.pdf
    • http://www.electricman.in/demo/frontend/web/uploads/files/xoragixobi.pdf
    • http://officinedesign.it/userfiles/files/56057552720.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vqs8l8im59vn7sp7se8odv0s81/27877361144.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a4dbae6a9---rakajodavelezo.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/89310516016.pdf
    • https://mytopics.it/uploads/file/zubabamimenokok.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d6cf0668f---71421096567.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/97aff4d1f6347cb9edf4e37bf5a5c926/70943733491.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=printable+alphabet+flashcards+upper+and+lowercase
    • 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_off0000d878.bin
31974ae8943fa8652e831ad4f9f20fd052ffd4c8d9b8368f66df1754f8161888
pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 19116 bytes
font_01_sfnt_off0001092c.bin
8b8c1aa3e876b7536fbedcba04c96fbbb4acc570ea758f4171f759aa846e8743
pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 11044 bytes
font_02_sfnt_off000122a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122A6 16792 bytes