Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b1d7f25b3c51da…

MALICIOUS

PDF

86.5 KB Created: 2021-07-21 13:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dfff477df2d9f7f69fad4f26d4ef8c34 SHA-1: 970c87c0dafb3c8109a218a281f3000da1c99d35 SHA-256: 58b1d7f25b3c51da16a81dbfbbb332697044912cc16ab76b8658673ff3a72cdb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f14c08ac97e---14570876751.pdf In PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a294c7eadf8---gegatataguzeju.pdfIn PDF document text
    • https://areicon.com/images/file/fakalevezuzerub.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/90289912063.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/083620b125acb67c2b73840adff7c0bc/8689890568.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/5c497e4c43152c10943d2ca80b739d02/sovukefinufi.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/bb40f9a5ec4dce9df495a813d39e4a46/sirapiriwulafigowaxevopi.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e3f0cc8fcc8ce90c4c750a6971395bc9/67177166249.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/xidokogubasafeke.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tuxajulaxixowi.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3aeb97dfcf43e01dd224155a538757a6/gubidotodepixunovepolero.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/89829414719.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/vivijijuwifetaxakonajazit.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/0495c1ca3e475e5fa51280fb118e5f59/63330235073.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/lasafusebopi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jb2dav86ifkvhf1hhe9h805bje/69122000069.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/zavinoxipefuraratedi.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/pudatixonigedonoponebotog.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/a39361391f6a8c6c3a561407b1e606df/53470819594.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/ea0696de998a5cb59ee4059110b1f667/33181797895.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/nuzoluzivologozomizod.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/f47eedfd303ccb3834555621cd01dbd9/234544584.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/4e6dce09cfb9a68967066a57e4d86b22/vumifenilorawagiziboki.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/nirixob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=spintires+mudrunner+pc+download+freePDF 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_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 11040 bytes
SHA-256: 54f2176d1636b95a0cadc038af1764c0e4dbe41525f7405830109f50b069f4b6
font_01_sfnt_off00010643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E55 17800 bytes
SHA-256: 5d9c028404b2d2f10c9d710c098df4eb0a27123c578ef9ad7faf3e099a23dab3