Malicious PDF — malware analysis report

Static analysis result for SHA-256 4462a709e773f2a4…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 13:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 012c7c94cbcbb67982d629330229978c SHA-1: 00a7599c11946202a37d562dae274d9bab465c8e SHA-256: 4462a709e773f2a47d15da043276d7d56dc2faabea9aedde3a2154ae07e96159
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of 'curls.se/upload/file/' and other suspicious URL patterns points towards the execution of commands to download and host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f5b069b9d---fikebutelimixuterofitaji.pdf In PDF document text
    • http://medicaldistri.com/ckfinder_files/files/18963831563.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/30727720323.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16142551064d1b---46672895432.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/givitoxesixiretevi.pdfIn PDF document text
    • https://12shio3.com/contents/files/jisagulakefubuj.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/luwuzogobuliwadomadewej.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c10eaf80a1bf99fc70c061890ed591fc/17491856873.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/11190516434.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/62269197800.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/fijesovawuwibofogujif.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8db1afe42---41491794844.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/zudatokoraki.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/5108067452.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/zovatixe.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/sonelakurokumezegap.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/15054485442.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/gotukomam.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sojim.pdfIn macro / runtime command snippet
    • https://noventa.cz/media/files/file/12981950911.pdfIn PDF document text
    • https://www.hippocratioIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+print+double+sided+from+pdfPDF link annotation
    • https://easyown.ddproperty.com/datas/files/zinamej.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_off0000e1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 10816 bytes
SHA-256: bc48fba7970909863a7192c620eb9278fcd9915cb2524912bfe463ffa58b70f3
font_02_sfnt_off0001127e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127E 18780 bytes
SHA-256: 5fcef5c3bd8b80152973cebbe1a6f22eb27411cf6db22304154e102478172e6f

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