Malicious PDF — malware analysis report

Static analysis result for SHA-256 525b68005d8149bb…

MALICIOUS

PDF

92.3 KB Created: 2021-07-10 01:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f83ef88f7e5c8f4648cc868594399ecb SHA-1: 7aa3050f685ae6e9365baa697003b374ef15527c SHA-256: 525b68005d8149bb8bb293713512452a8e879c8edc99d7fc3ad707de73d5b5b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting further PDF files. This behavior is indicative of a link farm used to distribute malicious content or conduct phishing attacks. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/2f0378c7ca5883d9ce856add3a408dbe/wovunezen.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608437e18fe2b---79841824792.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa7aec0c9c---51270590239.pdf
    • https://wineart.online/userfiles/file/gonotatukukiduwisit.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace8db18d12---waxuzatutiwom.pdf
    • http://fier-forjat-valimet.ro/ckfinder/userfiles/files/duxojobopev.pdf
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081f16c79e9e---luguwodifolusafuxu.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd63cea043d---17917513100.pdf
    • http://allycatering.com/userfiles/57813269025.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/4bbe630e0f7bf43d385f66d5b7e8992b/89325274461.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/ad7a6b462ccf140954635aba94411357/pimizilor.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd492f99ad8---89962567875.pdf
    • http://arohitourandtravels.com/userfiles/file/56492188653.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/99d7db9ab2325b2dc71378cd9992f5e7/24949862592.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160940905674b3---52097295932.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b0cb6a2e0153496512376f110eca1e17/94449855808.pdf
    • http://monroehighwildcats.com/clients/40160/File/reropepopijivepiwop.pdf
    • http://mrbossamktown.com/uploads/files/lotaporutumeledas.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rqa2kre3g6f7u4v1us7hscqv37/64177469870.pdf
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/widujalivax.pdf
    • http://szsahsh.com/uploads/files/97328527407.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/b75eaa1d450925abfc7e026dcff8adb8/dezuz.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d9f1dca7e---62873149688.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=twins+born+with+taps
    • http://pro.ovh.net/~tribuene/images/banque/file/rodupeb.pdf
    • 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_off0001041b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 16792 bytes
font_01_sfnt_off00011c2d.bin
dbe1a64584b1700ce586d0292c57496d42f7ae20e8b853318888e679e54b8904
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2D 18792 bytes
font_02_sfnt_off00014ce2.bin
97b98ec4bdf4638fb7fb7df3c299032f16c6b493733acb49607bcb7ed7268730
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE2 10360 bytes