Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f223c6235f1143…

MALICIOUS

PDF

103.4 KB Created: 2021-10-05 11:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 098080b669d3b58c358fee9bbcb121ee SHA-1: 508d3dd92db955d0d717244c2e5b2e5f78d66cc6 SHA-256: f9f223c6235f1143c4fcbcbf8ec782938a8309c6ecbe6eede6d6011cf6c3483d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL distribution are characteristic of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://pixomot.ru/uplcv?utm_term=the+united+states+constitution+scavenger+hunt PDF link annotation
    • https://securitydm.eu/slicice/file/furikonofireg.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce2724efcd---64679784767.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147713198cbd---rozeloduleriwojemufowovi.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/vidoxisaw.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/walazeb.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/zugepumulijar.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210908/files/20210908020244.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/77071645845.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/figopejejaxovelojado.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/45170609268.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109140603366063.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/mobonarabepalakibiji.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/15691624411.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/fusegabivutovogopebegi.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/sirugapumiv.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/52521925897.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/71672182972.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/kivasavulizo.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/xolowa.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16158a1db8f3f8---dovekabo.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210914/file/lizuwizovilibipepe.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/ebb9a6e4b9675f4449bab2475fda8a4c/55019350190.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/29299875454.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dccc07b047---70823590268.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/fezutov.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/17587621470.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_off000129ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AE 20656 bytes
SHA-256: 14a25ecedd5e68d51bc6990707a95749e051fd8239e13f0f729f923e2180fb08
font_01_sfnt_off00015efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EFE 10732 bytes
SHA-256: 7b3c559c465d223989a5725e8023e676ff073d65af6ba9f133a32d00feff7292
font_02_sfnt_off00017772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1