Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9760b649ebe24d…

MALICIOUS

PDF

92.2 KB Created: 2021-07-04 06:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 02aefdc36ab7b271fa238d70166abcd8 SHA-1: 6ec09f7fea0b9baf32a8b9d849fbf3522f50f343 SHA-256: 7c9760b649ebe24d1865e2d2aaa01e69cb8a8268c0b0b580d0ffee119012d657
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and links to compromised CMS upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=sample+letter+of+intent+to+enroll+in+college PDF link annotation
    • https://vydavatelstvoklett.sk/userfiles/file/41204326162.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89c1d5e1e---18622229323.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///sibufobaxok.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/xunubatijerogaropip.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/f2ce70827a318aba2c151ba711633ed5/14692464850.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/sofobowafix.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/mumafuladaduni.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/1c8p7gtbmgbjc236uq88tdqn7t/94399228503.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1a06a26dd90ce3fe4703f775c7fa4039/90718806062.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db8ff23f68---budegowemisazo.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092c05636af8---zizafesazunojenol.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/06ce23fd6472e27595f3ae0ce2fd61f7/88833390529.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/53853066564.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/b9c730dab18b12fc14aa4db523779580/62406084280.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/78607852714.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40b9319910---21106913339.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/nafibajatipamujaworab.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3dd0b4d6336ca2b53920fb385e459aa1/59883036597.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/jlbk4moiuch1lqdadpitovpjjf/29651700838.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/vibalitimejexawedi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2adf24f75---xafujusamasidefozeda.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/80087703543.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_off00010616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 10732 bytes
SHA-256: 2798af9277c50759be44f1b4a3aecee73ea5e98c37fffd68171b84be595225bc
font_01_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 17156 bytes
SHA-256: 524bcf72ad86f33536f9ce1ff9cf42515ad7925b99b54d4bc45fcb1ef9b89b6f
font_02_sfnt_off00014b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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