Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb24af85f145a92…

MALICIOUS

PDF

86.8 KB Created: 2021-09-05 05:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 28e6e9ee5716921fad37e82b476e77c9 SHA-1: e7dbca70546d7a39b69644c83847f1983bff24df SHA-256: feb24af85f145a92b9dbd952d7897d73af4482795a027e2a37f1f0044f6eb221
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of links, many pointing to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://nomylo.ru/uplcv?utm_term=2019+lexus+ux+250h+owners+manual PDF link annotation
    • https://clubslotalmatriche.com/calcas/file/86529658402.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/41298453529.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735d182cf64---wabat.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e0acd3229---51856930356.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fcf615a8c---13950819659.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/26386dea0c58dc0bec905e1d1255f655/22811884060.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/92599744580.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/79358639144.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a1285c0883edd1e362e0dfe05c2843fd/49468082952.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/kogekomipun.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/44a5d7c943cff76ed73b009dc4ea7be1/18492124710.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/41822079953.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/begigegelejib.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160de2c8a367ee---29129392890.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/e8caa63c4964abaa0b4cf8ccc0915d2f/23500580771.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/zaxekodobov.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c47f688a98---29462088162.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/8f1739a633b59a0b5a5dee27c3e87c7b/60975792318.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/83677685745.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/37042679714.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b518e4b73ba09676de1199665430f17/77581866723.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9f61a3f2db98f423c5ed43027cf03f71/83849185625.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/lixepepixovabirotilulig.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_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 18636 bytes
SHA-256: d0d5c94991335c9d6329bc5c12ce9435a66085fb8876039632317660e04dad54
font_01_sfnt_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001088f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 10968 bytes
SHA-256: a97db51f8a82c48a562b66e52cf8e0231c48a21675f972f822c597def92d80bb
font_03_sfnt_off00012211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 16796 bytes
SHA-256: d1936d2a8f3361141ee56c69aed864fb3d4c0e34e3f40106ee000dda25fd669e

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