Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdc490f1f32c15f…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 11:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f4680bccf9d78e827219312b598c8774 SHA-1: d126cde1eca9c4fe30a0a39b3f821792b949e08d SHA-256: dcdc490f1f32c15fc221c8e1a68e4fd0d3598abaa6c4138bca14a114aaf668b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content. The presence of multiple external URIs and the 'Urgency / deadline lure' heuristic indicate a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smirna.pl/files/file/fifigarut.pdf In PDF document text
    • http://vvk-wiedermann.at/userfiles/file/36287050151.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/xapinuzipedinubolufet.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/sulipilomilebifu.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/8cd965e9c26236d09f2badedc1890f9a/wiwigakupasodetidem.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/58981918025.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/xofupakegilodutet.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/kuwopap.pdfIn PDF document text
    • https://ismart99.net/upload/files/62746797355.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109121013548170.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/54731049329.pdfIn PDF document text
    • http://888chji.com/userfiles/files/22191081668.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/savitimukasekukugid.pdfIn PDF document text
    • https://sim2007.com/files/xeximukodezewajup.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/55764149612.pdfIn PDF document text
    • http://surtek.biz/image/files/20150324_023406.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/ruvujazebuvi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613760bfe481c---fefijegafos.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/vavufepomev.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161351344d2a44---11849997853.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161432b0eb0e5b---12395862068.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/ripakitosuxexomowesedezo.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210907_B111DE73273A3C12.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/27734405707.pdfIn PDF document text
    • http://www.og2c.com/images/file/79212371932.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/sebubaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=find+nearby+places+google+maps+api+androidPDF 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_off0000cb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 16736 bytes
SHA-256: c31cb00ba703c6edd8d6c333d48e172018dfc7df62aab6144b5f2050c42e7d8c
font_02_sfnt_off00010ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAD 10992 bytes
SHA-256: 4290dd9d2d6adaf8d4f621c93bad0b2202537722740e8f76fee6fe828c980a63

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