Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfc9c01a2490fe0…

MALICIOUS

PDF

97.9 KB Created: 2021-07-20 05:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 970f344e66022faed4a551327732d392 SHA-1: 78cd66228833e4d17d2a25a28b8d36c44532cea2 SHA-256: 6bfc9c01a2490fe02169177ac0552f76d493a0eb57b97f8d04c5595d6035a63f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, as indicated by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links. No scripts were extracted, but the structure itself is designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://go-pxl.com/uploads/files/76247035606.pdf In PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7997b14c57826c2e705a5dff9b94b3e9/67298449803.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/palixevi.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/76051268735.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b133a5c4b---xabozi.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160eca41aabcda---vobibewipusilurum.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1798052e88---januwilabonujovogobub.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/gerefujaxutapered.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a0b993629---lejukilexipiludule.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/49254545301.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/4969690459.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/xavexadonuzawiz.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606edfb81196e---64657503521.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///57582819240.pdfIn PDF document text
    • https://ghnservizi.com/file/dafirawutiw.pdfIn PDF document text
    • http://vce34.ru/attachments/file/muwigarojofapilapixije.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/toluso.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dac0d70f377---21484054692.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b545c741cf1e28de788b4a1e9defdd6e/limokawisedumivim.pdfIn PDF document text
    • http://epicridesnepal.com/files/xolafipuz.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081b5d51372d---25887089183.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/44061644936.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/9e3de7bc2c1795ec36cf0bee6a4df52d/51821387340.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dvmehfbk9t0b2f2illv34kmpk7/kazefanebu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd68c863b92---meguzorupepifuzoliv.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/vanoxogubivew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ignition+delay+in+ic+enginePDF 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_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13354 18044 bytes
SHA-256: 9f0450a72118ff6cdfbcc88569f4fd40bdc7728c6de018b7c7147a3951ac87cc
font_02_sfnt_off00016167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16167 10344 bytes
SHA-256: d0f8d5434304ed7a4ad4f90f3021a27395dc499043779ccd93ec6da432b2e601