Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9d8a38c2844c19…

MALICIOUS

PDF

91.0 KB Created: 2021-08-17 17:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2725831d30afea6ca6b2e7338b808e80 SHA-1: c12d3f338f6f26d7442c0a83ecb2e94e5ad53db8 SHA-256: cf9d8a38c2844c1964c12445da54b0f88c65b6db599294f963943bf66cf125e6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on compromised websites. This structure suggests a link farm designed to lead users to malicious content, potentially for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 http://cloverpark1959.com/clients/51168/File/fibepuwu.pdf In PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc341531415---pudenavavikam.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/65953970347.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/konojaxuvi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7440a35e7---xoxefolu.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/tokesevu.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6a0c58e5741f9937f6fb95b495ea39f8/71209685691.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f193a4fe52a4f6ec1752154d314c9137/dixuj.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/xurisojurijafofi.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11556423335.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210612193405-97411205433.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16103c390d85d6---96271458345.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/69452397052.pdfIn PDF document text
    • https://banghenails.com/upload/file/81394418976.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/36382426346.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/bb298f55261fb088f30268c187823661/67557317549.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/81854322278.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/27879669882.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/disado.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeb0f2f016---97061612360.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/jitit.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/7b195f7fe238855ca821cbc122e835a5/tafiz.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/getamuzuloxitemexug.pdfIn PDF document text
    • http://thaide.org/userfiles/file/62290908084.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4da84d4051dfac2933a0a59e3dc30026/tigipigekagejilino.pdfIn PDF document text
    • https://hgb.se/filer/file/398696819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=12+grilled+chicken+nuggets+chick+fil+a+caloriesPDF 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_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 18336 bytes
SHA-256: a94d022f31123b56e73a3fdc5e9361362b7f52b3afcac06a34be3b870e4e15c7
font_01_sfnt_off0001160c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160C 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off00012b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14399 11024 bytes
SHA-256: 1e1fcc8e221db60e034f52b379d39b78d6d07ee381af2274dcffc09a0c61447f