Malicious PDF — malware analysis report

Static analysis result for SHA-256 df105ed8060eb59b…

MALICIOUS

PDF

92.8 KB Created: 2021-08-06 18:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 66c6274a55a0788f2057468febb6505d SHA-1: 0f4f89fe4f266a7a174cacb85a3ba2d62732e40f SHA-256: df105ed8060eb59b5614d85818e6383b6475c366f48d017dcd8e7e5cb17957da
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ClamAV detection. The file contains numerous links to external PDFs hosted on compromised WordPress sites and other disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the ML classifier output indicate a high likelihood of this PDF being used to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://baltic-rt.ru/ckfinder/userfiles/files/solerijemote.pdf In PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df33ad50be---naladiz.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/73616e32baaa479dc8f8ef9575cd9e8a/nikijufusazemijimubuzojom.pdfIn PDF document text
    • https://ancoraeducacion.com/images/delesijowad.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/83956891235.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/96033595893.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ffb6c9d7e---tuxedezidumirijirama.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/83799122349.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/34873459129.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/f8rfqccs13i92ogolsb6usljsi/59872956887.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3680c00b25---3213262769.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/vituxulugolegexeruje.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/69458058143.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/5dd1d5af869c3b307baa3044e3853bdc/rurosajivogisusaweduxume.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/deebb17129968ef5b73942efbe15ac24/kokeduxovajunuzakebe.pdfIn PDF document text
    • http://maihome.hu/admin1/file/89269017707.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609036edd164c---28553501121.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/bajedoti.pdfIn PDF document text
    • http://midel.me/userfiles/file/45357369036.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/gidepivesesutadakigejuxop.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/45625146921.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16077f64491215---mejijekonipepezip.pdfIn PDF document text
    • http://charivne.info/images/file/33710442614.pdfIn PDF document text
    • https://esvigo.com/upload/files/ditavoxerorite.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/35703036944.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/t2dut5gp3e7vlmk5e0p5tqd31c/kexukibejuvid.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/22621070375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+name+molecular+shapesPDF link annotation
    • 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_off00010afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 10724 bytes
SHA-256: 99aa6b34df39a44fe1e29813ace34ae987ba02894720fcab7755279a14d6a458
font_02_sfnt_off00013b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8D 18044 bytes
SHA-256: 073ebe29c6e27e41c1b72a8d7d1294d7be4d865347958efe58dd5779d8552ecc

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