Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e556273d5ddb840…

MALICIOUS

PDF

89.0 KB Created: 2021-07-14 05:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bb7f4ced439bb845e143c26c4a3628ef SHA-1: 5c69cfc5e0017f5a13ed33be0de5f1e62140882e SHA-256: 5e556273d5ddb84013dafff51bcfd89faa8780a05f0812a2065fc2ecf73f6da8
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/84db65ad4c953cf2879347a83d692bc9/74258369605.pdf In PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/75237490807.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/mh5fam0mup6ptml9t6r79cqj2m/53797940591.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/56371036895.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/51231524992.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/2gr8d2absff6bk8a17fcha6maa/zupozavagena.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6e2644593e4738a7f0516ad00d744569/rotomofedenap.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/venilun.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608633d22fed1---73961890493.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/punenesawosij.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/jubojuxikezotaxan.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/tedukusumamikeparalavave.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/saxawazuxo.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607125969e9ac---58086668185.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c275d539ec1---xafalobiruwadidinuke.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b9a97c16e---67898861466.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/32872500867.pdfIn PDF document text
    • http://skomi.ru/img/files/file/31956607519.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/38797809466.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/1e939cf7f2c4487180bd848a1406e230/devafazakivorixukaxiwa.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16099159b482ab---10813785234.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/8mlcauqtv1kli7utnqatkauhv5/69867675863.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6890621ad6---82260605415.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b251e62a48a---nederivemalenowodona.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/94ec7a17b18b1206670aea258fe040be/48183404289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=metals+and+non+metals+class+8+worksheets+with+answersPDF 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_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 11012 bytes
SHA-256: 9c0f389f9a6b6ddfe263106c9162778830386a00a7e600ceeaf0974ce37644c1
font_01_sfnt_off00010fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12800 17404 bytes
SHA-256: d29603dbb5385474ba4eb82715f3a1a04d75cfd1caea85b55fe18305b218259f