Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf57aab0ad1acc7…

MALICIOUS

PDF

63.7 KB Created: 2021-09-13 17:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98035076ccb206b669d8d6d832b5eb04 SHA-1: 0bf50701d86f795e02875e9f4e2a5b445861124c SHA-256: cdf57aab0ad1acc737b88e3994bc7cb1790bdd30bb2126a31e35b14ee5f4160e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary function appears to be redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7082

Heuristics 5

  • 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
  • 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://fskyok.com/uploadfile/files/godidunoriwokuzijotej.pdf In PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/tiridimopuvasa.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/47778178369.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f315b951553d143442d499d36650518d/nanuxezokidotufinosifi.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/44342001378.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/jabiwidujunu.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/tupajixapirexefu.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161374baa626a0---litijorexa.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/63896440431.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/sumaba.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4092d4b9a---13927292402.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/kadilomifipinuwizazi.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/polunajoxuwexirisudizo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/qg9a5lhnbvd474fa2t2a9m1b81/28500801357.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210901/16304577264835.pdfIn PDF document text
    • http://geraldinekilkelly.ie/wapaxigo.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/69494878848.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///12787097517.pdfIn PDF document text
    • https://mashura.co/userfiles/files/xilowofifasagafomukopop.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161307a6163fa1---43120740837.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/74365600636.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/89946619283.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/nepexufatanamubezula.pdfIn PDF document text
    • http://industra.sk/userfiles/file/91084921988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=naruto+x+boruto+ninja+tribesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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