Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8a7c37a7fd4dde…

MALICIOUS

PDF

92.6 KB Created: 2021-07-17 05:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31da977f2e237d4973a6756daa2e022b SHA-1: 57bb2bf229615caefe3b498ba68a02b71729befd SHA-256: fd8a7c37a7fd4ddebe7a2e7afae90e5d7b9aedc5775525f154baffc351ddfb26
164 Risk Score

Malware Insights

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

The file is a PDF containing a link farm pointing to numerous other PDFs hosted on potentially compromised or disposable domains. Heuristics indicate a high likelihood of malicious content, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The presence of multiple links and the ML classifier's strong positive prediction suggest a deliberate attempt to distribute malicious content or phish users. No scripts were extracted, but the document structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 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 http://beautybybelief.com/admin/images/file/82435284843.pdf In PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/72757738383.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/63798270530.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/46969005837.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091966fbc871---92714293670.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/82668394639.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/42531129516.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/10173665466.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/mowuw.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d78d903bc---zejirinop.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ecd89f5cd4b81b6c411b36907d62a8dc/52414843383.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a686cdbe273---xusadogu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091e8dd3dd30---godusejezusi.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ttjsjvon0jkng0fu9moh4hq7i2/rutulomipomab.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c10ca2cb47c---pasarimudafetosigidadesek.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/viladikozonujem.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/jaxerexuk.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e2d471999---mixulejojilagi.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6ee19a89d217a84a9c2b5c1273237c34/40325143212.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/44f2fb9b7f6f4ac9e0448f81c8b4eff6/gegititifixazesakufivagos.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2ngcvf81b3a73nvijkihqd8h45/guruwotowebewilo.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/23705240981.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/958911dda97c80c1bd68ab4ff5e0f536/70976069059.pdfIn PDF document text
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/dilarovidunito.pdfIn PDF document text
    • http://pronobile.de/catalog/file/wokusuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=formula+for+calculating+volume+of+a+cuboidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_01_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 16692 bytes
SHA-256: b7afaf84c45f7fe033ff13198fad6c353aab88e76608fde028297fd3738b9d59
font_02_sfnt_off0001333b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B52 10932 bytes
SHA-256: 63eb75b0fdf0a7b25113fb49567d12e2bd6fa128cf65220881a6e91e69bfca0f

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