Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c8e796d26043c6…

MALICIOUS

PDF

84.8 KB Created: 2021-08-01 17:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3e98c2311abf7a3a212f1899f18a6509 SHA-1: a639cd8e835274c93700e29965548e5d7be189e4 SHA-256: f1c8e796d26043c667189b270453ec1e4cd5c4513c32e7a4bc6484b7f5a12941
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://geredekombiservisi.com/userfiles/file/sevenejaralunemijatimem.pdf In PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/37767471353.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4d7dbee11---16847242160.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f7d63d8673fa52126bdd2eb80894d57a/44950385318.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/89500800528.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/panabukukoz.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/jsbj43cvd9tbuhveh4ib2nvmf3/31873220782.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/41525638008.pdfIn PDF document text
    • http://jucal.es/images/file/89127355903.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c9f48cf3e---60441743572.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/06/25/34811115504.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7fe6cae7---nevijinodibiko.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160868824d22f1---6590376130.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b1b518798---83611627774.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/tivivubajarobur.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc5d97f013---fapepu.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ci6iqn96e6cmsnrn4l36v2e1p5/rewiruzijijimutunaxixetaf.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/142fbil81hn4nv1louudgpiq9m/36098003755.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160852e86c7ca6---lajam.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/bipuma.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/jawewavagatap.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/7b52718399d2e14659eff52cbebc41c2/kizitozutiluvipumes.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210615022741410.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/nivasevudanakisezebivu.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/misuvolatudizopavelegodoj.pdfIn PDF document text
    • http://northjerseyseniormenssoftballleague.com/clients/2/22/22e10641a135963e7b476298ec508c3c/File/kelonudokeg.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3cf4fc98e74f77c946945abc76c44293/kagezekiwagufifugewilef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+app+design+template+source+code+freePDF 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_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 16600 bytes
SHA-256: 1bf4e6892d6ec6a918e2c1dd19588541dd93a89b189a1bf400055071b0abb3a2
font_01_sfnt_off000112b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B9 11044 bytes
SHA-256: 85d394725b53d765c00fe85f381962d4a4a5768657390e5d134fd56236b73449
font_02_sfnt_off00012c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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