Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e8e86a7d36176b…

MALICIOUS

PDF

78.3 KB Created: 2021-09-15 20:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 471bbef0a338b78a53e497532c2d6198 SHA-1: bfab168d44880283088309f58b15f4c9396aae84 SHA-256: 50e8e86a7d36176b0f1fcfa470a16ead418cbece94bddf4f9df495645cc7ee74
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, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of numerous external URIs and link farm indicators strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=death+note+movie+online PDF link annotation
    • https://perfumes.dropship-tracking.com/userfiles/files/tiwiwijusuvijosivifu.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/kisagabuxitavivi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7cfcf31d---32878096892.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210912_15FA964832334A1D.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/70932564156.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/58976263326.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/zujivizoxofopananani.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202199181666118.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/napexaterila.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311dd036a46---xibuderuzuxigexoniwudam.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/89455444301.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161387b09afced---78854173657.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/25410617574.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/tufuxumos.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/2778343319.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/livapinobona.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/27110530044.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/54105690641.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/qn2mi0bbsllmvm6clrkkjdo5u1/69348741699.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134dbec0afa8---fetit.pdfIn PDF document text
    • http://deltools.com/userfiles/file/soteperidapukevopuvab.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/63630881600.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/danad.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/43447598315.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_off0000d057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 10172 bytes
SHA-256: 87d2cd0a330891524aa2acbba1eea72e463ac822dfe900af757d4ebec620210e
font_01_sfnt_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 17400 bytes
SHA-256: 6f88ef3bfdbe6bcb25dbe50e3eab62527e4ace986a5b0b671bb9c8335b1fdd5f
font_02_sfnt_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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