Malicious PDF — malware analysis report

Static analysis result for SHA-256 1524eae9d7bd699a…

MALICIOUS

PDF

202.1 KB Created: 2021-07-01 19:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fed7c56a1b0bf2675c897f01f35a1d27 SHA-1: cee91a72fb4c117c6213bc023fa60800d6021a4e SHA-256: 1524eae9d7bd699a61b0b7e0657ea8422a320b5eb7674a34bdfe98455596ec46
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits malicious characteristics, including links to compromised WordPress sites and algorithmically generated URLs, indicative of a phishing or malware distribution scheme. The presence of ML_NYX_PDF_MALICIOUS and ClamAV detections further supports its malicious nature. The file likely attempts to trick users into downloading further malicious content by leveraging SEO redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9589

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://ahkkpcm.org/userfiles/79356503036.pdf In PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/78293173678.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f19093d3b7---dumoluxupo.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/sopuwafafipixo.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/guwipefagogofikeperi.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/88659562969.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/97108565620.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/gaxumaginoxisisabeguxu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/a6r5fosvjmpd34trirqrrtm8v6/14489751395.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/rekabekodaraniwitujuw.pdfIn PDF document text
    • http://jinohair.com/upload/files/93423478.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c84fb9cee---tibovefalatakibubu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085f6e2de606---40269275521.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160787a2e3e9ac---7044650083.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/lixozowiwejupegamevi.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/sotafisamoxitatej.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16074a1494f697---tuxagisiwatizelevisu.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/pipimegumexifazufafipu.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/56385281769.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc351ec2b3e---nilirudir.pdfIn PDF document text
    • http://iphysiology.ru/upload/59234011402.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c0d005a71---bibatulavetoguziba.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607360a6f20e4---43881774098.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092453403402---fujutopozamat.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57b3d58ec5---26802529068.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210701_232826.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070120581954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+israel+lobby+and+us+foreign+policy+pdfPDF 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_off0002b9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B9B8 11120 bytes
SHA-256: f67273053bd3399265ce477063e4257b35545178147fea5534d7e8dbd95ceb64
font_01_sfnt_off0002d32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB3F 17876 bytes
SHA-256: 9170e8948bd086157493a6347e6c9f0d8fdc5c165a94b19e134a349f1e49aa4c

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