Malicious PDF — malware analysis report

Static analysis result for SHA-256 864bb0c968836857…

MALICIOUS

PDF

78.3 KB Created: 2021-09-23 09:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 642bd0b04fcd4e7cf4e786b15d42afae SHA-1: 7003f5b3e83fc4efb7502c9109fc1b02831739d1 SHA-256: 864bb0c9688368579c6b67494accc16be74e99effad798ba66b10905b15790a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure, likely leveraging a known exploit or social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wyslijpaczki.pl/app/webroot/files/userfiles/file/61320914409.pdf In PDF document text
    • http://alliance-ic.ru/uploads/file/30957176843.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/36331875365.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/18a1f7d28ad24980da3ef1eb2b332432/relapasogagakenu.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/tivat.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161372be19d18c---90403767360.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/90712371073.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61489322355.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/90300581579.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140fc6739cc9---libusejuxusarijoxerakeru.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/38898776699.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161361b439df7d---38103617863.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/45866707622.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/kapamiguvajadar.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a74310f84b61f8da1190244738d1f2e/lupenujofegumunidi.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/gajedaponutagajabanewavi.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210905_A01A58EFDCC32F5F.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/25494138028.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/37476885602.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/koguvizal.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/37377744986.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/loweponusifodiwekalire.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/28626429081.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/vawegexajoki.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/q97q8j4hidb1ik5gs15inhaf80/sidibozefurazadodojivubap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+game+ludo+king+versi+lamaPDF 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_off0000c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 10840 bytes
SHA-256: 5761bf9760cf93cb6561bec6910b77a08bf9173e51a83719424df1656897747f
font_02_sfnt_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 19152 bytes
SHA-256: c4dd1b9ae6a45588be42e347622df11af845f2618746b5bf053cace5aeb15c61

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