Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c1398a346dac24…

MALICIOUS

PDF

103.1 KB Created: 2021-09-03 19:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7abe696f87e0d9dfaa905a5bda06463 SHA-1: bb4fb34098a935404201b8351b012e0cdc9578db SHA-256: c8c1398a346dac245f224fe251be70e866f22ed0d1a291b1fafa77700177f462
184 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous links pointing to PDF files hosted on various domains, including one identified as a compromised CMS upload, suggests a link farm designed to distribute malware or phish users. The 'SE_DOWNLOAD_BUTTON' and 'SE_CALLBACK_LURE' heuristics further support a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://emotionpicturesfestival.gr/userfiles/file/95809074094.pdf In PDF document text
    • http://wsm.hk/images/uploadfiles/file/votetisano.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/77518523196.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3ac10ec25a7c3a62d566e641dd9746cb/12105051915.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/91884828927.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/55150563171.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/zazumepaburonag.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/jobejawajaweterejukoxu.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/tabegi.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210724_31D7C21CD3A9E95C.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/22772779134.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608253d8a4d22---gulamopopedodezatojivif.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/givakodusawumabefupajo.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/739bac6aee1c19e83838f56c9062cab1/rodewatozegovitebuk.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94912b062---gamemuvir.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/tisemagimozizosevipadena.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2a49d5d116b9131c922ec0156b493a0a/lemaxizeban.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/tujigilubujivulinusit.pdfIn PDF document text
    • http://wirheiraten.de/images/file/zixizubitop.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b4d3c900f---20402171845.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7a863571c8cbe23647277e8b8dde2428/12163990992.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/pezaremurexusujide.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074b3a3a8611---6447696867.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/93295610845.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/68208288105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=r+extract+table+from+pdfPDF 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_off00012acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000142e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E3 10704 bytes
SHA-256: a47a89003dfdc8c00385367fac4763a39a06dad83b2e739e146789ea250112cc
font_02_sfnt_off00015b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B48 19436 bytes
SHA-256: 5e3c0172e30559bee2722b5246f1e98ece33c5e7fd53ce954cfe371085b439a0