Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20b5c78e2cfe9ed…

MALICIOUS

PDF

95.3 KB Created: 2021-07-04 10:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e914ad50768cbe504ae9c5bb8c97e265 SHA-1: 7338c01c72afb921146e81012fa9397da09f70d3 SHA-256: c20b5c78e2cfe9ed5e477f5e2bcc790a802d9f948f39f5dd84daa769cc3bc513
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious websites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=primary+auxiliary+verbs+exercises+with+answers PDF link annotation
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861f3580685---81401615687.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc544691d1f---51825048005.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/65655554448.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/lapumidesumigate.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/043229cfe3a057dccf43db2269533d58/jozagakas.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/03ac04f5a939f9ccfd321d6b3ee6a4ef/26768456679.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a06194847f19895ce1026576ecf88048/96685061128.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898d7d9223f---81642434782.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/66a079855334e28e2300890a5ecf520b/94962682764.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a54248564d---kabopexodewivitefumar.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/fefafuvelomeboruno.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080a5ab88796---sejax.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/53767325715.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/33da6e24d19903c5d93e6e450d2101de/mazofiluzam.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091924a68421---55400453281.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/11660579218.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94a70627f---vufaresu.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/98273614739.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/01ec3339d110f373ec44ba2c1c27c966/17289093793.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/98162906722.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429131745174.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/33462623804.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090741000ed0---2713516694.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/40814496708.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/telujibot.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//14524417776.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/86319112899.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/onip.pdfIn PDF document text
    • 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_off00010e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001266b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266B 17996 bytes
SHA-256: 3c77a20c03b88db7a805e43673a72aae776231215dd0d9d4fed69a9321e6abd7
font_02_sfnt_off000155be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155BE 10984 bytes
SHA-256: 7d49d97acd3a66e9190f15f591c5ef5573391ac108009e8a41bf3bf690337373

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