Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33252ece8569760…

MALICIOUS

PDF

86.8 KB Created: 2021-07-13 11:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7771ebdf074bb04436a67fccec7e9029 SHA-1: 895fb8a7ccf6682d70297d49654bf32feb089e82 SHA-256: d33252ece85697604d88181764a6edef7f545f2759802b3ba4270aa99819a22c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/xogozoroniwinasesuko.pdf
    • http://chinocorporatechallenge.com/clients/6216/File/3224788198.pdf
    • http://bright-mineral.com/uploadfile/file/2021062303474765.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ngl6sn9ff1pglobu1sblavhoeq/jewogizawovixemijigibipuf.pdf
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/84642471666.pdf
    • http://jingluo.net/uploadfiles/files/tobiri.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/47f0e70bccf04041dd0d7b123d3f976c/gidoxixurepava.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd4ad8e78---papazetozixugakiwowix.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8f929045a23de2ec54f21a964eaafae1/nazutagaxiluxizugesex.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e76baa9824c---73291200189.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/vozumubuped.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607481ca03a8f---juvaxirolikizina.pdf
    • https://responsible-tourism-alliance.com/content_file/files/xodute.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a61340e3b3837d81826a7554d9f3f500/xoputazakofuv.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d64d98018e6---36600694564.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/irr2e39aegapt28itl4d7fs9lp/jifatovufoket.pdf
    • https://cecprint.com/images/file/53718354727.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c993cf55795---pinaw.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925c0241251---79242424009.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5566b0a5c6c519385f99d1ce68baebb5/84218204761.pdf
    • http://allaboutdowney.com/userimages/vujelapetevaxafawiza.pdf
    • http://novichiha.ru/pic/file/88752215768.pdf
    • http://stlukesmn.org/clients/17773/File/49918638335.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ce15b02c1---71123510542.pdf
    • http://trips-in.com/ckupload/files/69444289206.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/cb6439e5d572d4e139611a89b71363f6/72868286628.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=constance+american+horror+story
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 16792 bytes
font_01_sfnt_off0001055f.bin
45e1a1f385dcfef95924d21cef6719a5e837116db85fc5869a046c8f5f55542f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 10592 bytes
font_02_sfnt_off00011d6f.bin
20f38d39e122214b8093b9a52ca07758c02e1e02496772150523b803c2dd63a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 17712 bytes