Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8992578143b495b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 20:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b997fc9c712b58d63ac67d55a294615a SHA-1: dfc482a1a07a2a69c64e6ff189064b4165789f6e SHA-256: b8992578143b495b7b06476f3725830b9ef3da085dac319578292ce664ecfc29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI links and link farms indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://gmkms.net/upfile_editor/2021/files/45529520895.pdf In PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/c6f82480d1dc8ce43e877ee705b0110d/xixaxapamapuno.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/nutudopowezetinelij.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/86437827899.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/1abf60d10e882756222b704cbf961a89/80888875314.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722bb4d7c92---tilojubut.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/89098500075.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/46130576186.pdfIn PDF document text
    • http://runo34.ru/attachments/file/podiwadekaman.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/87277873320.pdfIn PDF document text
    • http://enricobarraco.com/files/datifafokinuvokevu.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106091500537034.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/pefede.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/jadofiwileloxag.pdfIn PDF document text
    • http://allycatering.com/userfiles/viwememaxedikesitutelave.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09671d99f---xinivoruwof.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160740341dd029---taxikepujufeluxitexixet.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/87971425147.pdfIn PDF document text
    • https://sy-tech.eu/file/51966054254.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/66056795623.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/gepabixuro.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/iuqh8h7g4p0hj54uau98c7v4me/gibebovusipagip.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0822e4c4---88004113558.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607327df3b87f---gesuborewibotanewazuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=shetland+road+map+pdfPDF 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_off0000dbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 18120 bytes
SHA-256: 43cc91e428aed96ba41b5277060e5d05ff6d480ee8e9b139c5a923fed5889888
font_02_sfnt_off000122de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DE 10576 bytes
SHA-256: 4f02a6848b7ad4b3e2f90c494454a458b826b52319583f547a4e88834fd2fbd0

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