Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed56f98afcd043ce…

MALICIOUS

PDF

85.5 KB Created: 2021-09-19 08:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63814967d371aadc9f90cdefd7b39fae SHA-1: f6ae28157dfded1387c88e5bd5c2f17eeed53676 SHA-256: ed56f98afcd043cee5eb06f6636a76f7b7a1205d050abd905ce45c4b74722bb6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised hosting links reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146753d726b8---89163222587.pdf In PDF document text
    • https://heyratacademy.ir/file/49165802404.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210917153818.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/86665206437.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140e1db046ed---73693798225.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/90033431303.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/75978250425.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/sejonobudofasatizomapajo.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/2816331297.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/xubosurapejiwuj.pdfIn PDF document text
    • https://felicityokolo.com/file/61349807080.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/kusug.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/93606392134.pdfIn PDF document text
    • http://lex.tj/img/file/66120615829.pdfIn PDF document text
    • https://durimawar.com/contents/files/76441340682.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109141822499480.pdfIn PDF document text
    • https://spyboarcams.com/files/merov.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/53780749176.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/kaduzopilumipojumelusire.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/pojazijivid.pdfIn PDF document text
    • http://dd-eng.com/files/files/75022482674.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/rsst0e6o4vapsphnp80coheq80/bulefizelebax.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/gadixepejedipu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9ea2267f---27313765079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gta+5+helicopter+cheat+code+pcPDF 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_off0000dfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 10512 bytes
SHA-256: 13303e44f35d968c4b81316a80fd399f38a0d5e203036eb2dbe116016164aff3
font_01_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 21680 bytes
SHA-256: e15b9e3535d9d07a19a71f93d0ed7bbbf1bb2bf1ef258d006cd05721e7655a8b
font_02_sfnt_off00013090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1