Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5b7bb8b76bc4b5…

MALICIOUS

PDF

93.3 KB Created: 2021-07-04 23:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b828cab9a51f392ca6c2a254ac38022f SHA-1: 3cb579aa5d370a5fe22509f83b4f56a54d9dc7dc SHA-256: aa5b7bb8b76bc4b59e4d5f606af30085ce6744c23d3c957d470fb9b7a81e9fa8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ingenermarket.ru/userfiles/24908982106.pdf In PDF document text
    • http://adams-gold.ru/archive/image/file/ruzikisedugomate.pdfIn PDF document text
    • https://nevisnews.com/userfiles/19847595023.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160798929e6ac7---fikaporowudasotixaxupo.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/541825447f5b162b91646f825e2843cb/dulukidudogapi.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/36527852514.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/94342875927.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/48677800890.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc44e9b139---17756431223.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/p2qm37dhfoq9h8ll4kueuvmnn7/jozojinajamanadeni.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/0aaab78e80810100ffd6947194d4326e/88878661296.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/37ph7eed58rg8q1lhb82enadic/relexigasemamezuzata.pdfIn PDF document text
    • http://bakoca.hu/files/file/lanotalozu.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/30604804720.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16090b54fd7d69---86525960178.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/nazokevidavurajar.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/982f3533df6243c675b657da4a4d8380/20442483190.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/rupowegi.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/2632b55c147841236d22ac7fa80db62e/77011834314.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/60168948868.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/c923ddf9e0e8b99e0a41612118e3fa2f/91951663514.pdfIn PDF document text
    • https://sce.tw/uploads/files/60ba104183986.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///vufafejogana.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3d605ed71---lilizugiwanutomawejemeluv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=words+that+rhyme+with+penisPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 2396 bytes
SHA-256: 520cf3386f71df1efdb8c0c25a99bbb03eb41cb85753c4b5b0d92760e30dee6d
font_01_sfnt_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 10804 bytes
SHA-256: 27fe3ac2467e402bb0a3db640b46d3c8d168ef38ff228e924c5cac127ba526f1
font_02_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA3 19668 bytes
SHA-256: 84131b563cf22a0e1831d18dc92f90626ca9ceecee3934bf626b6cc6ee34016c
font_04_sfnt_off00014cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBF 16952 bytes
SHA-256: 82fb568411eb3817b2344e40fd40cf3b3b032eb7bd925e7f7f225aa514f0837e

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