Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b065fb24cf6377…

MALICIOUS

PDF

103.0 KB Created: 2021-09-05 09:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cbda8dca60ba5f6a718e4d1df14ddb70 SHA-1: 41556aa27ab36ba2dd8c5c89f4c707e5f629cc8f SHA-256: b7b065fb24cf6377648334f59e090e2c0224c5f04d9d19dd159812d1c8a2628e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm and lures the user with a remote-support tool pretext. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to trick the user into downloading and executing a malicious payload or granting remote access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://ybshajiang.com/userfiles/file/2021-08-27/210827160258931462ifzcwzb7oko8.pdf In PDF document text
    • http://aescantabria.es/upload/fckeditor/file///bavesamaja.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/62601768811.pdfIn PDF document text
    • http://heureka-cz.eu/files/sirilolisokuwo.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/26488449198.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/vufuwuk.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/595debafd3c63720236dde68e16a33d2/12005091258.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5d18c925eceb1ed36d61c4476d1cefd3/mamagizuzivabodebuge.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/70739134510.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/20231278865.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/togezamewijapuzipej.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d0106f72387c131c1c03ebcb01867614/fozunefeni.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66211071719.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63fe6a094f---boxugofomuparejujenifubu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/t96b3tpgotftubi4pk57m6lfar/kixoxarezajajibatabinig.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/9153919e9a9e1fbf1dc40bb8015c173d/54591137530.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be11f66603---72565353665.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/hgrcegbplachtkfa58hal3kq1u/posixebedigexitevu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a934ec469b---14698930346.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/377809834ca9dfd1bd7f835a540327f2/zawuxasuk.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zemujoposabapevowuvi.pdfIn PDF document text
    • http://kvrhousing.com/uploads/65115930544.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///rilimezevegamodo.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/pizaxojafagum.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/wexajaradefa.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160982c37085d8---13416379321.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609638a86b809---kixizuvupuzedawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=factors+affecting+labour+turnover+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_off00012d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000145a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A4 18272 bytes
SHA-256: 34dd385abcee3a8b0b55bb01c48f312c30f38f5845c0164435769397f83d9e77
font_02_sfnt_off000174cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174CD 11080 bytes
SHA-256: c3399b909986f067247d1fe3c3f08c594a8993797bb04e01db003e946f7a5290

Open this report in the interactive analyzer, or submit your own file for analysis.