Malicious PDF — malware analysis report

Static analysis result for SHA-256 544ba10d0ff9f044…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 09:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b975818413c8725f83e02dcea1e72e1c SHA-1: 6d0e9ff800908462265911d74329480e4c932a55 SHA-256: 544ba10d0ff9f044e84b5e2e237412c160cc76a4480f249615c19838e2c781b3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The structure suggests a link farm designed to obscure the true destination or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609897768b51f---89187660363.pdf In PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/32979961129.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/80138354088.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/45905009350.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c02ecbb73f2---walujofadijufiwegaza.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beff305c881---samafizigelenurukujuxesiw.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/gagak.pdfIn PDF document text
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/40885931265.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4f62bd8093f5d34176ffab6f6690405b/rijowiwasuteberemipebu.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60f54d1197382.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081eef2da353---30533176263.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/gafiwitedotuzet.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/e441ec105692e8307fc0887bd4a68582/25911534115.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/43176962040.pdfIn PDF document text
    • http://www.celso.org/download/sejevinirudopifiwo.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/46674728214.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118e29da09ba---reviwi.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c516c88c4---18168442225.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/pumidigoxozuduror.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/nijufetasanesogepa.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7905b37a6f---pudutowekotoxenimovulom.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/22b9c63e4edd4581955c291b7597e5fc/23917509030.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/tevuvum.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d91218411---27819431037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=nominative+pronouns+worksheets+grade+3PDF 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_off0000cdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 17020 bytes
SHA-256: d4524d24263a46ffce0465d4d9ef037e36c891a312a420497d158b70d5aee7e1
font_02_sfnt_off000111e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 11284 bytes
SHA-256: 04dcd6e5c0010f049718394a6625c3840c7552f59e6e6f35a0822f595ec77273

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