Malicious PDF — malware analysis report

Static analysis result for SHA-256 95cda4ed774cc3f9…

MALICIOUS

PDF

68.2 KB Created: 2021-10-03 03:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 52e569f3afaf828a4eaf3e9ae47623f1 SHA-1: ed2d719368ccd9b04742f8e54307b38c4a5165e4 SHA-256: 95cda4ed774cc3f9e2b4f7a2cd24ee251494d3bc834794fe2021bcb8d14348a0
176 Risk Score

Malware Insights

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

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a clickable action designed to redirect users to external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous links, including one pointing to a compromised WordPress upload, suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://files.ibiza-ferien.de/file/79164576739.pdf In PDF document text
    • http://vimar.ua/userfiles/files/43946456127.pdfIn PDF document text
    • http://talleresjpg.es/img/file/zinewez.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/18315160930.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/81836621700.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/83673885748.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/23323380374.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/wafaromu.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/dawus.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109210622008887.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/79315273867.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf39eca337---wanin.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/mudinowixepe.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/rokipakuwagovudol.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/35583440534.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/sesenirefinexop.pdfIn PDF document text
    • http://royalgroup.at/tmp/38177533987.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/78817288044.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/vujitopo.pdfIn PDF document text
    • http://artediapharma.com/upload/files/92090998541.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/befumurul.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614192b0be01b---wugimo.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad973803bc---refamirewub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=futures+made+simplePDF 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_off0000afd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD6 10408 bytes
SHA-256: de72ad3bf12edbc18cb7a019230c5f10d9c41c67569a5d52d69929f4088d6f94
font_01_sfnt_off0000c762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC762 14204 bytes
SHA-256: 8e647b393ed06be89a8358b59ab600aa0c954536fbe18a6ec2ef232f41daccc7
font_02_sfnt_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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