Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd128db62677e63…

MALICIOUS

PDF

87.6 KB Created: 2021-07-20 15:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5fb171558a147fbe05e53ce127cb7ee5 SHA-1: c9e796516ed58018ee83dbceb967db1940fbda47 SHA-256: 1cd128db62677e630d121883b3675115494331557c3bdec2fe7c8568ebff04ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://tfh-filter.hu/_user/file/gimozugux.pdf In PDF document text
    • http://sgd42.ru/userfiles/file/30664851428.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/79228405911.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/wogusomewavove.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/80808757644.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8tco0qkd5q66rnmap4m55emq01/zevirerasuwumofolefolof.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/s7c2danmnd0bohdgput9orgm4h/gedogilifu.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/67175656515.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/lasisavojun.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210627200031.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/1690897765.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/96464927842.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608815ed938b4---rilenevimizat.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607967f195c34---tuwezubobojomapudak.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099b7ca09647---rokiwitib.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/2ab31dc2d7d79fa6388a675948286580/174613604.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/gosebogafovazepodefu.pdfIn PDF document text
    • https://abeess.com/userfiles/file/75787816011.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0049cc890---bibasunoniruwuz.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/5c17c2c6afd4b40d87c3de29767f9253/45641641414.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717021b4fba---zabovebawuliju.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa08fe4204---85692367688.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/4531700694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=driver+media+player+windows+7PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 17604 bytes
SHA-256: af8213d94673175a29111f1065bf3e445b0df8bbf8e590d47f444736045ca6be
font_02_sfnt_off0001387d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387D 10772 bytes
SHA-256: 58b549a1bc7e0889b3db3915c6ba581832d0898c3fdf45960a10105c516253a0

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