Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ea3e8bb0260c75…

MALICIOUS

PDF

83.4 KB Created: 2021-07-01 14:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6eac1a9f9bf929e844d6e875fa334f65 SHA-1: 48f4e2ad1fce026ec1e1563ad8fea49489c8402d SHA-256: 89ea3e8bb0260c75294e038313a82100162b978c0131c683372369556ae49dab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to various domains, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm designed to obscure the true destination. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or further payload delivery.

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 http://sanphamhanquocymy.com/uploads/files/21814140662.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16081e06d3ffdb---4087064086.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/92540440994.pdfIn PDF document text
    • http://df-2.de/images/daten/file/bapiximamotoz.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/21850755512.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1624154033.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/zoguvigewamisunobesilafot.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/virujepulejisul.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hlete2r6sfj3ns5qvr4is3tot5/73789820954.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160964a64763f1---defevanerupeduxaniwurifu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f6702ead---sevemipajiti.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/lorimowimuvagiboxeko.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13521774ca---57846818436.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/wabipewat.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbab64364b---zefutitagojif.pdfIn PDF document text
    • https://abeess.com/userfiles/file/dilobe.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/fd2ab98c94246525da4a1247a797f9c2/satugomisaxasajabuke.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/jekefemokiwaboror.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/97479320001.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/98400305220.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/15363704301.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/38900053807.pdfIn PDF document text
    • http://kfbi.ru/content/file/79188784315.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/zoxujazexa.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1ed2e2915---60158821261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=history+of+counselling+pdfPDF 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_off0000e568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE568 10840 bytes
SHA-256: fee99c11fa6ab129df1857b9c0449f581438994030fb215798aa808dfc73587f
font_01_sfnt_off0000fe5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001166f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166F 16328 bytes
SHA-256: d00d1a523457bb558eed78ab0659e68c28fc0814cd65a2a345ebdc5d0b22414e