Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cefad6e3987e830…

MALICIOUS

PDF

90.3 KB Created: 2021-06-26 01:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2a1fe5ed8de14c62607444d0ada4044e SHA-1: 40afafd17f53f6cdd899948a46a896e14c44d758 SHA-256: 9cefad6e3987e8305c285bf70e15a1205c6cfb40f42f84b7eaa8883d57c67729
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://allytemp.ru/uplcv?utm_term=graphing+absolute+value+equations+on+a+number+line PDF link annotation
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4e8a3ccf063344670d6b14e418356d52/14269830898.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/65700676152.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a28504b6d3b---vulejopuj.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/jokobudunijusisexejolegu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce084eb7b---delikozirijukakejowabu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073ae1107717---zubowejexozefaka.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/wixonekox.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/3316471460.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/7511890627.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b76de1664e---91701317744.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/k2ko022kfd3uj1hrvoi7e7n485/76628166199.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/nasijikosafa.pdfIn PDF document text
    • http://vinmexindia.com/uploads/momaxapefan.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/wipiwikof.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/59316646397.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gsd8165snkl3088esdfpskbdqh/82501327237.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75132405088.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52541575e0---kuximasovasosesago.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/31307985317.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/vafowixoluzib.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a33bf1cdf94---sebizudaduzanuwofafegipu.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/76734678002.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/bewigupefibowiwosupe.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/4p5nne11t4e3f5aah2tlbu12eq/gifabikuroperomizir.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off00011079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11079 11192 bytes
SHA-256: c526653a78f0db73e73bc32d2cf0a1a80f85a35a0e0bea97be0c040abc5077c2
font_03_sfnt_off000129fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FC 17812 bytes
SHA-256: 3eb715b846201c94f3feaf80a0d5c07423fe683d79ee65ef58f8105c199cbd81

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