Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e3c29a3df09198…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 15:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 512b22715bbcc9a7ed04389dd8a50f28 SHA-1: afb93265f8e4d6ee6e1b518f35be8dbaf7d376f7 SHA-256: b2e3c29a3df09198efd366ecfd48476b9e5470e3561ecd815055d82e6b4a7ce4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple other PDF files hosted on compromised websites. The presence of numerous links to potentially compromised CMS upload directories suggests a tactic to obscure the true origin and destination of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wellgroup.cz/UserFiles/File/mubiwawovadoma.pdf In PDF document text
    • https://akbaturgame.com/calisma2/files/uploads/fimilenegilatibafawujox.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/bamexazuzagafep.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/43928997568.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/kumowevaxajopanilibo.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/52999240249.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/16126888651.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117511fac4a0---kevaduxedebisojavafek.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/31c40827d5c40b4fb41d81b39a7e5051/pojalamobuzivulup.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/3252b197ecb39f14e5b0c81ff08780d6/bipuv.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/rokagaboke.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/554b0dd1cdda5d606e91af98a8cf3690/93061021887.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/6rrkhjj42tdlabsk7koekut5s4/35968187208.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cf5bf35554787bee93f838797c671c3f/ripamikagenekopemun.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/ligemojoratebidixij.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/27508368912.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/cfbef8a682c59f211d89a3b36ff73d87/wadaviror.pdfIn PDF document text
    • http://apothepharma.com/upload/files/47525973169.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/mi958gpg6gg5urqa23p1691ihj/30491607572.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/19d779c10af5f2bf1f84d46653a309bf/43638604932.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/19081433895.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/5183456374.pdfIn PDF document text
    • https://htapigroup3.com/contents//files/pajuxewopemelipetepe.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1278a81c6a---1771279115.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/77830165421.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/36532616112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=autism+behavior+checklist+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_off0000dd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 11160 bytes
SHA-256: fef2d46ea5f349658da2e5357941cb226546d5b379e3842e4ca314269bc14e46
font_02_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 17516 bytes
SHA-256: aaa1427218af4a117829403a5a3d3373e65fd425a01b6ccd5d879dc414d4265c

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