Malicious PDF — malware analysis report

Static analysis result for SHA-256 0086fe11177dd659…

MALICIOUS

PDF

79.3 KB Created: 2021-09-11 22:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f02f599f5fbf84f267c2b0e986c611f SHA-1: d8a9670a19b7c84941313001b8eb6640a961a681 SHA-256: 0086fe11177dd659065f9a558652cd673d16a53ee89ebb7465257fb8ac448144
172 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a deceptive download button, suggesting it's designed to trick users into executing further malicious code. The presence of links to compromised WordPress upload storage and other external sites further supports its role as a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • 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 http://cbgnfinance.com/userfiles/file/zanegid.pdf
    • http://thuonghieutoancau.vn/uploads/files/dutosipelenufig.pdf
    • https://htchninc.com/d/files/vakusujajodipadi.pdf
    • http://at2apigroup3.com/contents/files/28619960528.pdf
    • http://talk200.com/admin/admin/uploadfiles/file/97882073851.pdf
    • http://ladyqueen.it/userfiles/files/70739134510.pdf
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/vanoxewowoxo.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ea4498fbe4e36176515a2f2296afefc2/93703663010.pdf
    • https://eyetracking.pl/userfiles/file/xokotiwepipapurifo.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/6d6b92441919f754edc47f299b2f42f0/ruxafanu.pdf
    • https://nbc.com.vn/ckfinder/userfiles/files/95740587089.pdf
    • https://classoft.ro/userfiles/file/95026732331.pdf
    • http://abbeytraining.net/userfiles/file/38039443877.pdf
    • http://mynigaoe.com/upload/file/20210907220825.pdf
    • http://namngonviet.com/user-/files/39672201351.pdf
    • http://dentalclinicbangalore.com/uploads/62332766442.pdf
    • https://suprizpin.com/calisma2/files/uploads/76934092448.pdf
    • http://bright-mineral.com/uploadfile/file/2021090116093184.pdf
    • http://tareeapartment.com/user_img/files/zetexamafuzifatolidutin.pdf
    • http://hiace-yoshikawa.com/js/upload/files/42355512042.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6839a85c---35122319589.pdf
    • http://www.farmaciabergua.com/userfiles/files/nofetab.pdf
    • http://www.louisianarebarcontractor.com/editorimg/file/89546777818.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9d614f54d3438de701e854dbfa47fa41/61269804101.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cds+2+2019+english+answer+key
    • 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_off0000d104.bin
295ddda6dc773e9f463974ba6f584aa0326685318e6172044c505c03df32dad4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 11096 bytes
font_01_sfnt_off0000ead0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 16792 bytes
font_02_sfnt_off000102e2.bin
221fd48fba729cee8e4b71c50fa7bbdff1f4f18c87f1b0a8ec60c8030e3a2032
pdf-font-stream PDF embedded font (sfnt) at offset 0x102E2 17368 bytes