Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc037d4882c1826…

MALICIOUS

PDF

69.7 KB Created: 2021-09-16 20:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f39a5671805db606793773756c63f24 SHA-1: 30998ac97e81c47896a0857839316ce75b230afb SHA-256: 3fc037d4882c18262d99d7904ca8d33a67bb6ba78829074936ee297ac406a26c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to other PDF files hosted on potentially compromised or disposable domains. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ver9.sonikgps.com/ckfinder/userfiles/files/16594725904.pdf In PDF document text
    • https://yingzhaoliuart.com/upload/file/wedabiviraxuzijaritak.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/41607374237.pdfIn PDF document text
    • http://xiao-bao.com/uploadfiles/fckeditor/20210902/file/16305976714033.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/riwelewetez.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/08fb30aee7e274d8799667b9ab0ee941/15028221615.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/gosexozazabenofav.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307a798197e---xirekojoxibugefovujuxexel.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/lodaranenesanowi.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/22144690610.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/lenujebed.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/ganar.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/gilagupadizedefevute.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/38731370399.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/zenetepulakoxib.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/40324827975.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/bumeraxodu.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/jutamatimefisojesunete.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/62221178690.pdfIn PDF document text
    • http://retailcop.ca/files/repetolofoketuz.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/jokifapasoxurag.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161330ca3866ce---80489960661.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/wogisijatutedapivomodezex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+pou+mod+apk+unlimited+money+and+max+levelPDF 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_off0000b3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E4 10844 bytes
SHA-256: 2f27d0ea33c7f0797dedd68646724dda35a5bc5bb75997359cad3f4466135ae0
font_01_sfnt_off0000cced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCED 14224 bytes
SHA-256: f7b5aa7bdb6551ed71898975f046919c71ed74df98d16a10f32132b054ec8b7a
font_02_sfnt_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1