Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c47fcac48965122…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 10:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2310c11736acea225fbf80292efa1fa0 SHA-1: a2536573663ef181053798e4f247b292db1616c5 SHA-256: 1c47fcac48965122417e9d1b0d72d4c6e2d4cd3ca1b3f1bdc3b45b135e736d86
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to algorithmically-generated URLs and compromised CMS upload storage. The presence of a 'download button' heuristic, combined with numerous external links, suggests a phishing or malware distribution attempt. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=block+gun+games+online
    • http://smolninskayahotel.com/userfiles/file/29534851085.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/xupofane.pdf
    • http://be-now.pl/userfiles/file/fidifogejon.pdf
    • https://zzhqhi.com/d/files/42295603269.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341738a6597---pagedematalokomojubufagix.pdf
    • http://finara-v.com/file_media/file_image/file/57682418819.pdf
    • http://zekejozsef.eu/FCKfeltoltott/file/netevijajaradozivozinuwe.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0457dbe3---19223284094.pdf
    • http://jysfh.com/upload_fck/file/2021-9-5/20210905025117670653.pdf
    • http://beming.com/ressource/site-image/files/8938505460.pdf
    • https://bleikss.com/userfiles/file/75991802119.pdf
    • http://struttur-arch.it/userfiles/files/gemurelivagifelakomope.pdf
    • http://goodtraefarm.com/ckupload/files/zuganupuniwadejitev.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/2799c47cc3b75db2eb19045327e73adb/89697455669.pdf
    • https://evrenmentese.com/upload/ckfinder/files/55017770057.pdf
    • https://rlmahtani.com/userfiles/files/7559761251.pdf
    • https://gelblighting.com/userfiles/files/nikonemudemot.pdf
    • http://hoadondientu-ptp.vn/images/ckeditor/files/3045869794.pdf
    • http://ersenergy.com/UserFiles/file/ralinifulemefumetidazomu.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/pufome.pdf
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/65586375014.pdf
    • http://abwva.com/uploads/files/nerixetumufajigazisalugew.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_off0000dadc.bin
de2cb6616564f4fbcbb13648dc3b6c4dc2bc0c51209bf5ca4e8275f1c94347c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 10620 bytes
font_01_sfnt_off0000f323.bin
87647447e50f698496eb969ed2576f43c7fb2ddb92d67534d20c7b7e8af90987
pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 18104 bytes
font_02_sfnt_off0001228a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 16792 bytes