Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dedc03a027149b…

MALICIOUS

PDF

87.4 KB Created: 2021-09-16 05:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c5dd12f4c63073f001414cecc5c1a2c SHA-1: 1f59484be17e4c0bc6b141abca8a41162ba949b1 SHA-256: b7dedc03a027149b615c70f381e86fd73604608f7b4b923ea4a69cd1844ec34a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised CMS uploads and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful external content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://originalcheck.it/public/img_admin/file///litol.pdf In PDF document text
    • https://pannonfinanz.eu/editor_up/9249690041.pdfIn PDF document text
    • https://kaparatt.com/images/File/tikijowenutemezosimopaf.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/wunoguvegepugobune.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/xiworofoto.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/89649752452.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/kivatagutumagenebowawum.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/82508192980.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9729e9c6---riroduwotafalu.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/mavanuxisofiludit.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/98420673972.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/kogunolopax.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/vakexudasekebizej.pdfIn PDF document text
    • https://advik.net/userfiles/file/pavenofomudogadelubo.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/44620968949.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/93403356632.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0eb9d1e761fe4ad6400b674fa8202dfc/66348113926.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed361c1eb---84373452575.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210909_B03F4363D0EF3CFE.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/refopekurazigoxesalu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161377049a7bb7---76323640720.pdfIn PDF document text
    • https://digiconelectronics.com/media/bevapufojunag.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/85167845958.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/vovisativedekowop.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/12374960411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=promo+code+buxarmyPDF 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_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001068a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068A 10480 bytes
SHA-256: 9ebb5580fa392e786adeb87a89dbc67b701e025d5dcc63ea915eb3762360d394
font_02_sfnt_off00011e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 18720 bytes
SHA-256: 0208a1614624d8f4a19e06147c066a5e5f727a1de263d8f97fb95415c8516843

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