Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1923776e6cbf6a…

MALICIOUS

PDF

90.2 KB Created: 2021-06-27 21:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f468ff9541e80504ac0db693f1f11a51 SHA-1: 4864f62e1b52035e355dba4def15181976a68592 SHA-256: 4d1923776e6cbf6a59657c7f688e4c63edc7311a24fc5c254ef5fd2d0bae7f8c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious document used as part of a broader attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://accesoriosalmayor.com/images/userfiles/file/88168242893.pdf
    • http://babamoleskine.com/files/file/17385054232.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/im8jn6mp1k8v8pqqk486utfht7/pipuxor.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba71a34ece---peworaxujadore.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/famvf1skjs5pl9ou0516bv1ejf/wokidujowowubinupanufobe.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/977d4287f3bc11e034bb5b48131712cc/gadepiruvikilasa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6e0d75619---8165639990.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/pupirujamejimejos.pdf
    • http://rajskiewakacje.pl/userfiles/file/lugibifexator.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8dc1523310e6c16dfd94a1fa4908d06e/72339832358.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0267ceb3ae---21247311469.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/6ae8e2bd3c16418b5a627ee3383e9efd/993462721.pdf
    • https://sahyadrisevasanstha.in/userfiles/file/buluvivo.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b50e68cc---xukodidadajisafexirexas.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ql11ivqhcc1d8siaravf42e0vt/midetisirefigumutepopa.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070bc81a73bd---18608816654.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cd6807fd4---pakuz.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607881af0e397---33566814092.pdf
    • http://osc-pribor.ru/products_pictures/file/70822601009.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b48295e279---34353533055.pdf
    • http://hanleyresources.com/images/55447817597.pdf
    • https://iwnta.com/userfiles/file/fovanadizimixubusexunezid.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/hjt012gq3j4fu3h4fpsbngh7f3/86009394594.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/e61469c596e548564bfd62785757c99c/vudelutufodelufevuxutak.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/51d5d48c05a39699914a5d9cca7bfc81/nezuge.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bohr+model+practice+problems+answer+key
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f78f.bin
de7b0b4b9dbd6f60b5339436007243290256146fabf87e4a74e19ef9cdf16061		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 11264 bytes
font_01_sfnt_off000111a7.bin
41d068a3755aa781b34f4c68a37f60fdc8ee6768c07fdc51b4fe5e834dc99592		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 18544 bytes
font_02_sfnt_off00014367.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14367 16792 bytes

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