Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a05ed81f6bb3d5…

MALICIOUS

PDF

69.5 KB Created: 2021-09-13 15:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e06433e1bf8ff8a41e874d6d4ca37c28 SHA-1: c1d06d20313b90aadac32fdef3209680a8981af3 SHA-256: 37a05ed81f6bb3d5deee551f58bf3fe65f77bd931f4780c9e75c3e24d956d954
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier returned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with several URLs pointing to compromised CMS upload directories or disposable hosting. The embedded URLs suggest an intent to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pointwebhost.com/calisma2/files/uploads/97564032103.pdf In PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/guganulomeno.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/80204675988.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/jabokutowuwosugifiwe.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/jexulusuwujet.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138326504c95---28082951949.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/55687113733.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/kasebegolujab.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/tobopabederofufa.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/29586995187.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/latubobiku.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/moxujajosudifitimerasi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/kujunatawinaxizewizopij.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/41575260031.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/b02v8msgeaham3gnakfqgqtgq2/40699128834.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/93475578084.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/917ukk7vd1cvqu4b97is0bsio7/24461792444.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/gelopuxodamumitoxuge.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/bedajosaluduwulaf.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/71521610436.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16131261d46aba---xuxabolodepixulumixatu.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/34368994110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=my+cafe+story+3+mod+apkPDF 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_off0000aec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC2 15832 bytes
SHA-256: 5808487ea66d3117a7b430bd7046a89f6d4053a95eaa2a8e1973ca7dc3d6b68b
font_01_sfnt_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 10908 bytes
SHA-256: 8ab79f540ccd00c637b0fc4076618553ed89da31bd0947b2937d569780cc41b1