Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7977c21f3ffaef5…

MALICIOUS

PDF

86.7 KB Created: 2021-07-10 11:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 63888c6e6a77325b2bd15e2c4dd79b0e SHA-1: dc587ad695ca704d96a13fe7e4f8f6be614226bc SHA-256: a7977c21f3ffaef5df4d7ddcde714e10c947692e6bb901d44386e1a557662d83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://chcial.ru/uplcv?utm_term=mosque+in+tagalog PDF link annotation
    • https://laser123.com/geektic/files/bijaw.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/360501b3200953b9852c4a2211b8945a/bifexamekitinomun.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/9fdbf2b9f83f00aa326628cf05515cf0/guzajifowapafisiruviku.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6565d9573---72144304922.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/kasodazoxedawox.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b7ba97523---gisurevimoxefokuboseje.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/29137599249.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/43282619563.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/v755irn5l962dehti3fl4boro4/gaxiwejabubevanujoma.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/wajug.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/81634072097.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/rumozarede.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/1254437045.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/npp31v0jhp125jjpn0raoqaj37/jifaxasigafojejetugi.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/39089984373.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/jedifavulemoseviginugu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45cffe95af---59583926316.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/mewimuvilisamifoxu.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5a1ef18f---metorotuponilibejara.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160861d889377b---fusitaxonigenoberafol.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3889808813---26407587379.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/64753642594.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
stream_004_off000119bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x119BF 17768 bytes
SHA-256: 537d3de8f6bf9f33e070d9b3dadf6a29bfd0d5e2c4252b2cae16d96e063d3a34
font_00_sfnt_off0000cd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0E 20980 bytes
SHA-256: 383fadaf20e25bb017d41905000973858759502cf8c4e0e0221de1ad31697084
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 10424 bytes
SHA-256: 3c9b6bd64585f01200479f62069e65ceae89c127c6796c9541764256cc3d5b2d
font_03_sfnt_off00013543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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