Malicious PDF — malware analysis report

Static analysis result for SHA-256 be78629e0e275731…

MALICIOUS

PDF

73.7 KB Created: 2021-09-18 00:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c30b0788166aed75a85c9f98b630aadf SHA-1: 2d60a1abe4811d4b07ca2be1ae641f14cfdc6439 SHA-256: be78629e0e275731bcb3d5d4884c2ef536f298da54a8ed1e381197e842b232b7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting. The primary goal appears to be redirecting users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://scro.ru/pic/file/65463470885.pdf In PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/rugofoferalonebuz.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/75814644625.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/dinaravejegotabudoxo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/mgg142hl2th7qpd78kbltb0h69/zemex.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/wojabuguxelex.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/tibesuj.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/runazujuxipawikixob.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/563503679.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/vijirenodovaki.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/55504489386.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/r7sn7fc8frlcvptu163f4or5su/99724470593.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/17608616677.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/furumezijasopij.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/nuwipolidodepal.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109090325259359.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///vumojukepe.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6666585969.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/t37h0vhe25b204uu340vjgku60/47132106087.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/39339654571.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161375c09b2a2c---8612077521.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/13929972818.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/56335617804.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/rodubexotaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=check+app+version+androidPDF 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_off0000b743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF55 19308 bytes
SHA-256: 59694a4846173caecfd61a2320f0e4cd6748946f707929aa9d1e972f54fbf95b
font_02_sfnt_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 10656 bytes
SHA-256: 63aa9c7ed45d8f55f246d002df83584edccc7c04ad5477c1cd29e19d03f4ac8b

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