Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a1e11c3fd0749f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 00:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 241f86a1d6b2e488004567f1208a2195 SHA-1: 558cd7e338f968de7d3b04451da77081cfa96dc5 SHA-256: 81a1e11c3fd0749fa2b65f142f9cca29b855ca60068e739fdf3c39af29b5303c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs across various domains, many of which appear to be disposable or compromised. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing or malware distribution campaigns. While no scripts were explicitly extracted, the PDF structure and URL distribution are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=wps+wifi+apk+download PDF link annotation
    • http://123dvere.sk/files/file/wudugosekelejuliwewujos.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/29595035465.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/61034520548.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16134bce80090f---setoralebimadox.pdfIn PDF document text
    • https://path.mn/userfiles/files/49382841035.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/68475568840.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/jutitowim.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/31155590152.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7ed1894936eed34ba3be0736e7b025ff/nivolewofafusuxeko.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/23145880577.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/paduzijiwowenijagedazaf.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/najijepun.pdfIn PDF document text
    • https://bawauang.com/contents/files/7453551974.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161465e940750e---27715448611.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/gijiwegijigutejefifazige.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/xobik.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40168194363.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/22737027380.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff4f3a1574---61003033597.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210902231637.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/lovidivurunugulifun.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613275bc3aeeb---64049492120.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/57369890634.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/jesizejet.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_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 10332 bytes
SHA-256: da77f01df7d297dbfdc3defe67042d2ef5d9cbbbd1fe924cb16bfbdc485ec0d2
font_01_sfnt_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 18464 bytes
SHA-256: 52e750ee308d25f0432785789f1145633b06e3daa71af7801ed982e46325c7be
font_02_sfnt_off000121f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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