Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b29c24073e0aa0…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 05:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a8defda169012ea1efc612ddc3634b33 SHA-1: 0eb32756d2796e1d68be3790160ed23e85689e2d SHA-256: 31b29c24073e0aa0446b81145f2c71f49fc02b173359da615fdc5e95c8cc149b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to external malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://medvor.ru/uplcv?utm_term=rtx+for+mcpe+free+download PDF link annotation
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8c11d13e4---xosomigupikid.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20215271948.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/gilisixilo.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/70216458619.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4e26732d5319ab91a43aa40d1839dde0/nipuwututelimezowanix.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/59337966517.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b741521a3ab---18894151600.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/27930461310.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a597318a9c---98572758127.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b2937209641---xurinenode.pdfIn PDF document text
    • http://kisito.com/userfiles/file/koluxutax.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/samovupolizujinuge.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/21444865757.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/263bbc8b5e6005ee378ab4d8f0e61de7/88957701018.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/32703713008.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v06va1un0lpbge9as0hv9dmeu6/2647498092.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/jepojonetufemig.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb443f802---puloxuzaxivejo.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/bs0rbqm3lj49ou0tb6vdf9k3c0/levodukesudubirovuro.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/65923678930.pdfIn PDF document text
    • https://actor-conseil.com/files/file/14443215043.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/8628622691.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160716df9f30d6---81972301804.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/robotipufeginawobafoxazor.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/6q84ssprbe20eggnkqgu9h5ic3/mofulegaxofato.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/zajokawovojusat.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/fasex.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_off0000ca7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7C 10752 bytes
SHA-256: 4708818ed06c42fdd379dda7796b511258bbba75e0fac1d37de501cc3e69f9ec
font_01_sfnt_off0000e353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 16804 bytes
SHA-256: 1681eccc834353a05185cda6755cd4996e72f00d8938a3dcae507583afc33619

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