Malicious PDF — malware analysis report

Static analysis result for SHA-256 794bc856b5b35129…

MALICIOUS

PDF

111.3 KB Created: 2021-07-25 17:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c53e16d6d65554b69ff7c883894dfe5 SHA-1: 2f8dbf13e32286ff22ba129598fdba41ad4db3b6 SHA-256: 794bc856b5b351297dff7460ede3b656da809392839c5916450aa02699da6580
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains exploit code. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The document body was unreadable, but the overall structure and URL analysis strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4927bc74703e3c2013aa0b3f5b978142/kibazil.pdf In PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6be6d43fb6---bewabawafiw.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16097dfd40a9d7---dafuwilopiz.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/paputeputegawepejoribil.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/kifubemexisugipokuwusu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df936a1b3eb---93353878475.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/39a4c0c32b270bd847be0e7cb1990bbb/89203465707.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/8rc08uu94tfcuitn3a48bhdns5/70483680828.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e598cac2688---62339359872.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3b90285d4---18163332385.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160879b20c4f08---tajomi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609014fd4d6c7---6610448861.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160759312e0b2f---33787539093.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be271f38827---14184966792.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210618_213E76A82020FCA2.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/zopuxasubobalarorilisis.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/74d30845e71bb05fc6a78aa2cbd076d9/borege.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/26mrcg1de1thtci2d91s74jcj5/60413544923.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/17382707859.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/4096928381.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/90147266953.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/bfjcp29opum6gtbsk7ajamogj4/lakelujupori.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160867a1b706ff---52243325405.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/gitulufobugogoripixadamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=beginner+chopsticks+piano+sheet+music+easy+with+lettersPDF 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_off00014b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16391 18408 bytes
SHA-256: f38cca302f29749554b93ad8b46375a278e24af9c9f63451ed6189dbb2c2d417
font_02_sfnt_off0001944c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1944C 11264 bytes
SHA-256: 9c537716b4346c7e1d2d645d3677c4612a5f54857640937639f4701449e1ee08

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