Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3707ff183ed20f5…

MALICIOUS

PDF

84.4 KB Created: 2021-07-07 17:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8fea9b8a0c5b61af2c1c802b8ad17ad4 SHA-1: ce52dd3e83606785d0a58571971ec2f43370c01b SHA-256: e3707ff183ed20f596cba3c3db8697a5cc76353ee40feac89ed909b7856db248
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of external URIs and the nature of the link farm suggest an attempt to redirect users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608180d509b71---renaloraj.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847c9c8a2d6---93039232669.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/96902910146.pdfIn PDF document text
    • http://orderkai.com/uploads/files/dasovatedisokovo.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/xibukonivedixadixogi.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lulovizoduguge.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/93f3cd72480a46012a8c8a9949e26e25/68891456262.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/92e6db22634dcf7a77db551a112b5c15/3643977990.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/57075703087.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gemufetumavupo.pdfIn PDF document text
    • https://arerp.kr/data/file///sexelorurasulekulalaxeril.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/9np3vs8gn5m4525ua7vi2dsau0/7130100258.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a680cdb42d---wizapoxitavev.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/c81d81521e9c539d0ff5f84586a82a97/80912144343.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ab849bfe837579450b34568900557abd/88330650713.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b5dbf572b475497addd2f0705aa5e2d8/zuzawojijogawonovor.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/jalasilitolibigami.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cb0b667b---dapokibebufokuno.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071bdfa6bfb6---98301568284.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/nunanenutifevowuruxizinu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d632557f---bisofusu.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/bfdd9e9670a21f8378b04a55e84df938/28676428891.pdfIn PDF document text
    • https://mmszke.hu/files/file/15993868709.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe3e446bd7---sosaxedolefadokobesopik.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ac56174c36b75ca7bef4f3a37e325749/diwugelusorelivirinej.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608843ac725cb---pufifabumotewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=heartbeat+normal+but+hardPDF 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_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 10484 bytes
SHA-256: dc6304747a46c47d28a5aa5600179c14b6923707d4635d598f6992b35f314698
font_01_sfnt_off0001008f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 16348 bytes
SHA-256: 987c2fa45d0397d0ea867948e3fb70c480658c87739eb9ef0bfbbef67e190316

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