Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8bfc369c9bce6a…

MALICIOUS

PDF

91.5 KB Created: 2021-07-16 15:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21814c2a31143e7c5fa4c33a98931a2e SHA-1: 7bf1f4f073f45efce9570e80c156adf6ba351a3b SHA-256: 5a8bfc369c9bce6a210c2db62c6d692fda7d9873e0f84c0a6457754456ae4ba6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for phishing or malware, leveraging the compromised sites to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/qvdjbm4m6p1amv86uvodq7n4n9/12239520073.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3b8483676---26352506304.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/91251402148.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e45fc120c---98036722418.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/0rsp5ke902in75gn09pr77qn6a/13365571270.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/c26561b37951a22630d2a1e7ef8c3ffc/27669378824.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad44e8ce5---vejimix.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/5c8ece1c528adcf44a3f8e7a4cd25205/12626480720.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2ba2d02d2---69184542794.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/37752084333.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4843a1d24---32392017124.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb0e2d5311---xubibikenuzajomezad.pdfIn PDF document text
    • https://dhesient.com/media/kozarosoliwojexenofirasoj.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/76300339036.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/20045295945.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/60277298342.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/vaxadulolikeditudofumibu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/pl6jmlq9ji24edjpphmaio8gok/wezokotiri.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/5k52sllmndvqcu7b0gcmg8su64/5489624145.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd6211b17c---juvovawugisurikale.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/jazepudol.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/035e855e51590388fa7b56290fe6c6f2/pudepurixeravixir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=wh+question+worksheet+for+grade+1PDF 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_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 17568 bytes
SHA-256: 7c59f7e840daab6a4634e6fda7f8515563a2cdfddf7ab322e45d321d95ccca6b
font_01_sfnt_off00012f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F47 11056 bytes
SHA-256: bdde6ec27fc6e1c8b342bf8cfafaf6ffef75e73682beaccf4ada0b0273fdfe49
font_02_sfnt_off0001489c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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