Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51a49250879f73a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 05:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 646f0f742ed01fb79609e5b208ad6191 SHA-1: 63aac9b3023e960495eab86a691a65f34282e064 SHA-256: d51a49250879f73a92e444089498738f39ea9070791a7633bcf4efd61aa0aabc
194 Risk Score

Malware Insights

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

The PDF file contains multiple links pointing to compromised WordPress sites and disposable domains, identified as a link farm. The ClamAV detection and ML classifier flagging indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and the PDF_RANDOM_URL_LINK heuristic strongly suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5019

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://ambulatorioveterinariosismondi.eu/file/wuwonujuzubebepifozof.pdf In PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/28234450581.pdfIn PDF document text
    • https://euchebnici.com/img/file/zugepojaferawaxeluwuxaji.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/vevalelu.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/48116608670.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146993216030---wukobapurukag.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/mikotew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613755ec89554---34101333109.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210903220454.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/vavudimesulobob.pdfIn PDF document text
    • https://crv.dascalita.ro/app/webroot/files/userfiles/files/79447677074.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/jazajixotok.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/xeruxiluzokedafoduj.pdfIn PDF document text
    • https://birotex.rs/images/files/magugigopazosikezosi.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316639edbda---vonikisulokenevelap.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/saxebirevodusawovepu.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/zajap.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/34714703482.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130080b06c7b---8268086449.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/fefapanegafi.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021918519126681.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210916_135016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+stop+ads+coming+up+on+my+phonePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 18612 bytes
SHA-256: e846b7edf0d6b52c725b42ccf1e7a6f6d1aeb36d679813b4416500aee05fb916
font_01_sfnt_off000122d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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