Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4fc33b1cb674cc…

MALICIOUS

PDF

87.2 KB Created: 2021-07-03 13:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2b047e957a3d849c97c27a2a934c5cf SHA-1: 19fdb9551b1b3bfd575b57061f9b38ba042bc2ac SHA-256: 1b4fc33b1cb674cc7f57aa954e44ba55f9abe7191463b763c74b4c2cedcdafd0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to execute a command, a common tactic for bypassing macro restrictions. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lead the user to download and execute a malicious file, likely through a compromised website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c682113ff64---kebogedukuvogamisujukaso.pdf
    • http://upoart.com/ckfinder/userfiles/files/45457140477.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/955a5d2e9435430c06b7a4cca75424c8/xoxugasato.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/7ksnsr43dvragl173fjtal0ju7/32720476200.pdf
    • http://www.bluewhaleline.com/image/upload/File/90099092161.pdf
    • https://alakharia.com/public_html/userfiles/file/56249804897.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/fowesipixaxuwetugozavu.pdf
    • https://chp-travel.ir/data/file/roxezun.pdf
    • http://cp-1.ru/userfiles/files/13199816534.pdf
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/zavemugereb.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/a8a26705fc4f996e3dfafeed061eaea2/40120248074.pdf
    • http://scamps.biz/userfiles/file/mebusulu.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/37d5bc70a71c5ea5ed5f5dca9ba2218b/18711691544.pdf
    • https://aldurra.ly/images-editeur/img/file/nelovatipusubuvafibomib.pdf
    • http://ampletrekking.com/userfiles/file/27502377223.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eefa31aa2---48025430643.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/4ql72ddnikftsvoperuiek8ocl/sidekewe.pdf
    • http://hitecds.com/userfiles/file/46972877409.pdf
    • http://jhferry.com/data/fckeditor/file///37481212460.pdf
    • http://elitaliaweb.it/upload/file/86248110673.pdf
    • http://cuboni.com/uploadfile/hong202106090357383395.pdf
    • https://stratasphere.online/userfiles/file/zorumazuzi.pdf
    • http://palaciodelosnavas.com/userfiles/file/80847514808.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aedc70b6c---34309778402.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=windows+10+audio+out+of+sync+with+video
    • 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_off0000ef45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 16792 bytes
font_01_sfnt_off00010757.bin
eabc9b9db4213bec7f6527c8cec9cfc7e1317d4ac5a223311e8e3a955c18ec8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 17808 bytes
font_02_sfnt_off0001360c.bin
756774e62be343d84dec14a0338b7e92ae76475b044052508e8d2d547f4a2f33
pdf-font-stream PDF embedded font (sfnt) at offset 0x1360C 10960 bytes