Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bda7f2e6f17e4b…

MALICIOUS

PDF

71.6 KB Created: 2021-09-18 15:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b908391322044621278b493c260f7d39 SHA-1: e2b358e360d63f6333e306ef8a0322f15519264b SHA-256: a3bda7f2e6f17e4baae4af6f9dcc3f42f11b895bdb13ce6b857f23ec2a216014
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that leverage embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=s10%2B+android+version PDF link annotation
    • http://ildong.org/sa_upload/userfiles/file/20210916112804.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134670abae6a---64952465007.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/65154182920.pdfIn PDF document text
    • https://aedwea.com/upload/foto/31618832765.pdfIn PDF document text
    • http://anpharma.net/upload/files/wixajagavogunigid.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b5b5785b---vebanapijavonuxufumo.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/ranefama.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/ridunalawokemedadakuku.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/gobosa.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021912_4289_930.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/fuzulawewadete.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/83497289203.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/76378531685.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/muwotuse.pdfIn PDF document text
    • http://africareview.in/userfiles/file/67966134528.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fcc72dab0272de1e0b3c55b2ee5c8fa3/nebiro.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/kawutawo.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/xezunusegujawugi.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/249380ffa5fefa5a2e3b03b06ac75a7b/62603961716.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/86739769894.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/48896255668.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/sozirubumojesuvediwob.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/76581840701.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F0 18760 bytes
SHA-256: 955f18a8efe4926c6c6aa9c0dd55f273afc833912567b3710fb42db911b90c82
font_01_sfnt_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 10412 bytes
SHA-256: bc80e12bb3e34a2f113741fb8830df8e0e4539d1503a1823d33996272c17c64d
font_02_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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