Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd00fe20c09b97c…

MALICIOUS

PDF

74.4 KB Created: 2021-09-02 12:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8b35942e5b45ce6db636d866f4a12bb4 SHA-1: e266ec2717989c2e74842fa591e5e9b26b34cdef SHA-256: 4cd00fe20c09b97c0304c64f9996744858b09c814a411cb3dff03a02bb666ab5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and potentially disposable domains. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content. No scripts were extracted from this sample, but the embedded URLs are the main indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=manual+for+bose+700+soundbar PDF link annotation
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/55e1083b3e11085d9fc1e0a460fcf27e/75316486681.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1628184672.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a4fd2b489---guwidugiluripemavot.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160dac2a08c78b---92950015909.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d372eb763---ronulefazofotogutejelowag.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/bcdc2bec5755404395a0a6c0c2c660ee/zawon.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/wisosiwo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b7621a80a43---37105263434.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2be95324---gevamitukaxawomumig.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0c3ce669aa7841157da74bba7396e6b9/zewamakuwevakilelege.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080dab25c3ac---tilaxuvuxebibap.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/88542161937.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/n5ockb6tsl1tsss1kiumeihdap/zotux.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/79077239865.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210818022052.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20217511692795.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/39764548f2a850e08c7512b81fe7eb00/kopikulokekobezurat.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611913ca9b76d---poxavuj.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d5ee5a4aa---31520081832.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/bc389eeb739915715ff2e97ee2adeb78/vatoziris.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/tuvujubaj.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/tuvizomafemez.pdfIn PDF document text
    • http://computerdoki.hu/user/file/xobuliviwu.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/dediwapegewunagimutojala.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_off0000be1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1C 16928 bytes
SHA-256: 5e744042502a15907fa265ffbeaa9b05041ee0f5d7fb077808b5bc729fe35a25
font_01_sfnt_off0000e9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 10564 bytes
SHA-256: 80bab3f6fceabd0560990402d4ba497788775de31c90150a4332b9b7f5a0a259
font_02_sfnt_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.