Malicious PDF — malware analysis report

Static analysis result for SHA-256 880c37c9e035cb5a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 09:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 452b4b7b2d9e53909a6efeb1333916a9 SHA-1: 45a15448457ab8401f8c795afe04f685a8028e84 SHA-256: 880c37c9e035cb5a8425b39d359b7213179b5c9f8416c35d5db402277fa84b00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting an attempt to manipulate search engine results or lure users to malicious content. The presence of multiple compromised CMS upload links further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://powermailer.in/userfiles/file/tupabukugobawilirabo.pdf In PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/27375121988.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/10743494928.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/48533124795.pdfIn PDF document text
    • https://dacola.com/upload/files/buditodomimidotaladusar.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/90266918528.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/a5pmnke7e2mvcvu6db0vamedo2/8675709624.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/20625599125.pdfIn PDF document text
    • http://citra.cl/userfiles/file/lekudujijekexudigo.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/22451845978.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021083103032873499.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7c63e07e80c4078efe6a5e7b28b45965/nolup.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160be0f350065b---xizivimomi.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/lolotetoxawiterido.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d778463ca3---zerisigifexuv.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e86d896698---foxoroma.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/keporipefetisatovaloxo.pdfIn PDF document text
    • https://sca-kc.net/scauserfiles/files/85388137414.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9760ffab---lofumef.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5ji0kcq2sdnidevl5nc8tnnmg5/33330709384.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b605414e096---63226233629.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/9slv0s9bhm2cc7tsbq5a5dgn4p/tulipepid.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202174416322991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=candida+di%C3%A9ta+k%C3%B6nyv+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_off0000dc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5E 10596 bytes
SHA-256: 256dfc9ba9cac56c951bcba628f7e7e33fc1af6186ec65a87c00b6d6a370625f
font_01_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 19808 bytes
SHA-256: 7384893b45bbe3c872c07b9e41be85dcd9c333cbebac4dcf36dba6cf6a263159
font_02_sfnt_off0001259b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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