Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b1001793dd6acd…

MALICIOUS

PDF

83.6 KB Created: 2021-07-23 16:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6ca83b7198b19b9d3d58efed60c16a37 SHA-1: 4138cf68fe68646044c2df0dd1e2a35f09ea07a0 SHA-256: 49b1001793dd6acdef304d6bd99fdfe300b9a69c4e9a4b7a8b0a757dae082a93
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 it's designed to redirect users to malicious sites. ClamAV detected it as a phishing trojan, and ML classifiers also flagged it as malicious. The file's structure and link farm behavior indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/59548093af0ab262e114d4e2b6745abf/pesejizedizukeniwidejape.pdf In PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/26003816552.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f061535f14---71449297049.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5db2f84330---sazufelulovufukel.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/zeruxa.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/15539581641.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/6862932481.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b20e3678511---88501348345.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16087e0ee7cd3b---zotoj.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607058d1ca3cb---wadomonetuvipufetumu.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/6dfb74937587f963b579ff8824eb834e/livorozu.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/pevevikagijuwegejenom.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/xurureg.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/kigidurinisurifariralig.pdfIn PDF document text
    • http://contelex.it/userfiles/files/rogijazolonox.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b936de359---40874965763.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160737fc0ac8f9---28144283892.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e4f94e0c6115802248ca60f6b9294f3e/67471128846.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f50058f8b8da024236285d4ae97bb176/kavulunezadojironizow.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/46650432878.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/66aeffff8050eab189f0db8a35172b32/36147505923.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/fatazonozenewizezot.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20216301430301996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=exercices+sur+les+multiples+cm2PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FB 17724 bytes
SHA-256: 5eec912c61243caa1ae853270a7b919f34a474cdd4930de6d3704e4d998d26e0
font_01_sfnt_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 16684 bytes
SHA-256: 0b66887e43cc35630d0970669c797ecfbf492bb097841a83f6681a0f5b87338d
font_02_sfnt_off00010dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFF 10452 bytes
SHA-256: 36c19a2de8c3848accabfea68c5ec464ceaf50af0b7e46617222ffe0eb1da4e0
font_03_sfnt_off000125d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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