Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89f15926161270f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 09:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83a3f0558e81318ab470fb30f335e34e SHA-1: 0b607744d53c3ae3daa5bb0cb2cde92ff8e8fb24 SHA-256: b89f15926161270f815efabf73055d077421e3b5ebe7a896a90720b9e012c24f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically identifying it as a phishing trojan. The embedded URLs, particularly those on compromised CMS upload storage, are suspicious and likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://binarbaidequipment.com/public_html/userfiles/file/jazuroper.pdf In PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jopuvexunopinuferu.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/74381859771.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59f12cfcb---99520815452.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/gelipovijejejemomefu.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/38847534973.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/xolikenazoxadaribasetitu.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1630551023tusekedudetomodajivek.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/77443672117.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/sudivokasetoze.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/15179698629.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/47828820771.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/giponilejimoxusados.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/4489067891.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/dofolufibakopeton.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16132ecca565fa---nefovigapuxe.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f700471b---58494041624.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/91626273996.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210909_140912.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/ruwedegi.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/31775503012.pdfIn PDF document text
    • https://hojoairport.com/images/file/vigidavagowubugurer.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/49533540216.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/62465912461.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/sinuwozomopiwewadipex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+service+callPDF 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_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 17588 bytes
SHA-256: 89c1f657d786511abd808d7884aa9830b39d8f4c0f74c6f5c83d2f6567e27aea
font_01_sfnt_off00010a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 10312 bytes
SHA-256: 153c2c55659c5a760f7bc2a73b571b74a815502f8db092ddaa3b934c79442f35