Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2bb10ca8e171a4e…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 22:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a25759fd35fef5dcf944eb28131d32ab SHA-1: 6798546f4feb85edd0d126e025530433f4c429b3 SHA-256: f2bb10ca8e171a4e99d239d2f9d85640e1a56c431f7332021f1a1531ce065428
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The presence of numerous external URIs, many pointing to compromised or disposable hosting, strongly suggests a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://n-v-v.dk/userfiles/file/roxufituzomirefipeluweba.pdf In PDF document text
    • https://psychologgia.pl/Upload/file/wadoparud.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/27348101498.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/jovufuzu.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/41628418424.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/45426574121.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaeeab2ae4---refafeberakibelapevi.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/dofifamofu.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/43324536313.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/tumenanokigegotevinafig.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/nesatebimi.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/mupabizo.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/26483296245.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/gukoxurutawikifej.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/teniliziduvufolekumuwuve.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/34039725006.pdfIn PDF document text
    • http://lgassociates.in/uploads/8219376478.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613f194561dde---masebovuzaz.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210909021021104928811.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/28253638437.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161319748cff92---64733433331.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/jaxir.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d4e686135e---84403758062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=my+summer+car+android+apkPDF 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_off0000ae51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE51 14960 bytes
SHA-256: 249983a245ecaa5956c73600e209000a0461c3f5ac3e0f0634c1ae2ca81c111a
font_01_sfnt_off0000d327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 10828 bytes
SHA-256: 0ccd148eeb4e2ec1b0c69697bb5377c25fa31f4d393a002c0b9eeaf0be3aeb0b

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