Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b752b5aa165f4e…

MALICIOUS

PDF

70.4 KB Created: 2021-09-23 08:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a12945ac04fd38d15898be6d00ca8c7 SHA-1: 1c9c42077fc4a556e6f9d99f57fed7d8a8efdb4e SHA-256: e7b752b5aa165f4e5007f1384a69f6f7e987c634bac978c0010e0f1f0506b04e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://allytemp.ru/uplcv?utm_term=psp+games+under+1gb PDF link annotation
    • http://www.casasemio.com.br/ckfinder/userfiles/files/22963685613.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16145c535732df---37454706226.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/sokatirafilelufopunemabev.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/wujij.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/kuseziz.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/dorapelifixukezavip.pdfIn PDF document text
    • http://eventechsite.com/files/files/ruribubarupavigekavadaj.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/17249753169.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/tusunuwukalumeriletag.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109180803482919.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/nepusisusolaw.pdfIn PDF document text
    • http://ijfbn.com/editor_up/59477501164.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/fcg42lc8cn6h3a42e2o73gjnln/xelusifuzasipujelamodufes.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/539f3be66cb1b53b9e973aff15d967bd/famijapufobesa.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/pumovogofedapagapojuwal.pdfIn PDF document text
    • https://congchung7.com/upload/file/28011585287.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9533039627.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/vosafevuvakozefudo.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/pokuwirasusizem.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109011033257373.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/69560603858.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132d63c91d0d---bedawisixapaluruzuvax.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_off0000b3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CF 10672 bytes
SHA-256: 609a6c0d99074c54eacf9e9d25c74fdd3a1a0be57d25f796b2db4872b43f0075
font_01_sfnt_off0000cbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDD 15844 bytes
SHA-256: 61d52aab82d2b96cfd95233dec42bee95dc2212beed5a8c4249d8da22109496f
font_02_sfnt_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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