Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9e2832ecb746a9…

MALICIOUS

PDF

72.6 KB Created: 2021-09-25 13:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bdd20608fd00b4691f7eb54f76a2847 SHA-1: ac8998526825397b36f99c45dd4b69ae259c9888 SHA-256: af9e2832ecb746a9560a720bfc0264301a4b3131bea6593cb3f876d0bc7be60d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=boku+no+hero+academia+heroes+rising+movie+online
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/sipanote.pdf
    • http://mbeautyconcept.com/upload/content_images/file/ranitetalev.pdf
    • https://xetnghiemadndanang.com/upload/userfiles/files/wanajabapuwalimexu.pdf
    • https://globalcircle.club/userfiles/file/7011564669.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481c7c27470---22132159353.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ad87c90ff---pojogexijakigaseruru.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143dd0de30dc---gawufavuxidalutu.pdf
    • http://fencefactoryny.com/userfiles/file/58156082273.pdf
    • http://telesson.net/_UploadFile/Images/file/28366977056.pdf
    • http://barrospizzadb.com/uploads/files/buzunosikamiburojixewi.pdf
    • https://doan295doson.vn/namthuan/images/news/files/94894428788.pdf
    • http://tuvanthanhlapcongty.biz/upload/ck/files/fifuzamufezijipafebox.pdf
    • http://portalinmobiliario24.com/uploades/fckeditorfile/xakalikemilupojomow.pdf
    • https://pierrelemagicien.com/userfiles/file/tuwepi.pdf
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/radexepodowipax.pdf
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/moborekujop.pdf
    • http://learnazia.com/fck/imagesfile/bivafebedukapi.pdf
    • http://aeronautike.com/userfiles/file/86541017943.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1c04c629c---82842623025.pdf
    • http://sunwisechem.com/Uploadfiles/files/naxedokusobexugaber.pdf
    • http://penzionriverside.cz/files/file/48857788630.pdf
    • http://dental-forum.ru/userfiles/file/50209920424.pdf
    • https://ceccarmaramures.ro/userfiles/file/24795675314.pdf
    • http://rocb-ap.org/file_media/file_image/file/51975959342.pdf
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/kezavusur.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5c8.bin
d4a3565986817fc29d3c1a34ef82e9689a958203d53babc39385a73dcdee3523
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C8 11028 bytes
font_01_sfnt_off0000cf11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF11 16792 bytes
font_02_sfnt_off0000e723.bin
f31966614babaaa3c5df300a342c47d0dbaea179c714a1d691cc48578e2ade66
pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 17460 bytes