Malicious PDF — malware analysis report

Static analysis result for SHA-256 e29af624d22c46b1…

MALICIOUS

PDF

86.0 KB Created: 2021-09-03 09:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a91544cc19b806fb1187d2adb938683 SHA-1: 7da9c6f64a0b047db41a4a33d29fd10f1fd0bb2e SHA-256: e29af624d22c46b1adb759eb847c20e162825abd46a77d3560c51d7637283014
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis are sufficient for a high-confidence assessment.

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 http://www.recko.ru/ckfinder/userfiles/files/79546164626.pdf In PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-31/20210831183034504631.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/97290386358.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/97509546326.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d0f64812a---devapisetudaxutiba.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/mukunufawowererasirevun.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/48843343464.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/43096985811.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57fc15c142---93382034981.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ab1034a9---vujibatitumivexa.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/42300298409.pdfIn PDF document text
    • https://lbassicurazioni.it/file/41159218176.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/sikubimowixurevive.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/o8pb7oe368j6228e30aa4arft3/20880343918.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/bijuteronage.pdfIn PDF document text
    • https://ka-base.no/images_students/files/27535695976.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210707/file/1625629972.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/kitawiwukabuberigaxofopan.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160912bd179ea3---vevevekinabonodolo.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/gexelalutoxemeb.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/6438f4dab90e48ebac2b88e7ecaed15d/55761043813.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/26bf6aaf223101f9a3f05f5283761c2d/94533121495.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/d2hdhvv8v7fejsj322nn24erm5/vugepinelezerewo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be0b2b5d7f0---kobiviparok.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/miraxinufas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sears+kenmore+sewing+machine+manual+model+148PDF link annotation
    • 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_off0000ea56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA56 17488 bytes
SHA-256: 3092e68fd8e0bc954a25578528bbae71ec22fe0318f26693b76f55f13fe2fc2b
font_01_sfnt_off00011712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 11412 bytes
SHA-256: 779f005031d02a4ed27443f4db915f7f7d4bbae8a2bc9a11c8895d4fadcfb4c8
font_02_sfnt_off000131ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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