Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a204f837cb8ef30…

MALICIOUS

PDF

81.2 KB Created: 2021-10-11 07:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 180054583591ae535b04597a9d40bf49 SHA-1: fc18d281c86d1682dab69fd760a33868b6e42033 SHA-256: 5a204f837cb8ef309fc79443186e66cb91905a9ddfe0bf641e92a66cd9512db2
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The heuristic 'SE_QR_LURE' also suggests a potential attempt to trick users into scanning a QR code, further supporting a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://koyomisushi.com/uploads/files/dimuvadileb.pdf In PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/pubejevegefiva.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejarulupazakug.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/97207976326.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/wekobopo.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/61802613334.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403e99c89a5---dutumagojosekewigevo.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/ledezani.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16141729335533---kidinolelikuvibadum.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/79316172161.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/57813501454.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/fovikiwanezosona.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/42116467845.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/99492260718.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/69527914725.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/61720602245.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/40595836617.pdfIn PDF document text
    • https://digiconelectronics.com/media/zesetuse.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210922190410_2020182852.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5e7c7b1c07a65efaab581a3fbe7c12f5/11513534750.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/fawejalepelixolumobomazi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613581850366d---rewekinepopebozideleg.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/84141849193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=18cm+equals+inchesPDF 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_off0000d87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87F 10584 bytes
SHA-256: e98ef93d98be9676ca1f2c678d23d4cbf42e609ac3d77817ed4e8596335ce4a0
font_01_sfnt_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001087c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 18140 bytes
SHA-256: 646ea535605dd78e735d3ed68f0779a2862989b68e73b9b059719296f511c6aa