Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a57734a842dd0a…

MALICIOUS

PDF

85.1 KB Created: 2021-07-07 09:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ba2e2b9d2e7c21de67b6f5e6f31f0f5 SHA-1: 53bd4f3aa8c9540b4ba4546e2190cdb6d6251855 SHA-256: 80a57734a842dd0aebbbc9a1f9d66632901757c7bb615c4122e257633343a4e5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 http://cheers-gifts.com/userfiles/40667795232.pdf In PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/d7934406fa603de641f53bc81efaebf5/xuvexavumodo.pdfIn PDF document text
    • https://avenue102.com/uploads/file/22152732504.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/da0adb4b45206cbf906a9d43277a78ca/pupikaxemalasogumi.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/49605402177.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b7c3eb88469d422ea288776886ec8046/63013834714.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/95996116391.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/jesegijunufu.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa4cab0d95---sefitetirasevulas.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/rosafuzag.pdfIn PDF document text
    • http://abroadster.com/files/letajadolemufo.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/32775469968.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0f515212e074e5669e9a0385b8204a8e/15089514338.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/322db5c7014302ba8bb89e89bd94430e/sababafafigutezeb.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/21524252280.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/mt765hrtt6l94766r3uftmhsc5/30038720481.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210528123829.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1756d8ec2---zujaniwidozeber.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/98umdso49r1ikn2cf8uvlad4a6/24884307416.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/zifuvep.pdfIn PDF document text
    • https://papiratisk.cz/soubory/21738192849.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b875f518682---83801279185.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/92316811636.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/31910307629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=art+project+proposalPDF 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_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 10280 bytes
SHA-256: c6d58e7a29aa0118252c0f7cc69e510d2e6e56074e962bf43f121c02b41ce40a
font_01_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 16356 bytes
SHA-256: a5d8b14af6c69293c8e981c0f529f82a0bbe3e3064f4702dfe6ec2ccc4d657dd
font_02_sfnt_off00012f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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