Malicious PDF — malware analysis report

Static analysis result for SHA-256 4624c7b3f34cef73…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 13:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8830712873ac43783471c05c71ae53be SHA-1: d1e23e5dbb9eab5789efef153bf0d49553094894 SHA-256: 4624c7b3f34cef73aea62cd9ce74a593df582015b0cf6cd5cd4307a7cf3b05c2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/af6dbb699967bdc854fde9cfd9b8bd5f/59558649277.pdf In PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bc013ed35---94649348882.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9d7d89fa63f5103425e90059b6ca746b/40111316820.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/wewapitemipajabinukifad.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/dakoborurixaj.pdfIn PDF document text
    • http://cuacuondaiphuc.vn/upload/files/24020129927.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/93j9001cqhabv3s0qmkusr57c0/10894384918.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/63798445901.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a53e2397877---ferun.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/55625e1322343c617a597647ba220d56/famadizemediwix.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c4mm6bja1v8lj7tpd3ahobt2v4/5580828231.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091b353cb0b4---xewasuvidebosukato.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/vaevklvmd1jl5brcefcpvcn4p1/97829653549.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/21026722686.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gsivh901f1oalsfkstv8f86ib9/48282254016.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/618ee58b15401762367eedb7cc75a460/89696068485.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/22829400c255bb00c6548710973621c6/33653585290.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/2761793381.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/22893ad539850a80e57abebb69486c42/29809681749.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608753cfb7f06---80619974291.pdfIn PDF document text
    • http://araonline.hu/uploads/file/70211605039.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/aahngkbmt13oipf9kggrj94cvt/44513861919.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079d83b21409---sogesalidejodapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=warzone+tower+defense+unblockedPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/517ab483f9bfd8f6e3c91b81e600c134/95385437977.pdfIn PDF document text
    • 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_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 17476 bytes
SHA-256: 06939e715fe36fee3f69c55afba1f3fd45f217750570a005edcd90ea7377af31
font_01_sfnt_off00011911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13128 10848 bytes
SHA-256: cdcec95af50c0e1b4e272b104a8d926bef40a5938e943a3d69ff05cf0daa1b48